<?php

defined('_JEXEC') or die('Access denied');

jimport('joomla.application.component.model');
jimport('joomla.base.object');
jimport('joomla.cache.cache');
jimport('joomla.http.http');
jimport('joomla.log.log');

// This model implements document searching using web search.
class OpenAireModelSearch extends JModel {
	const LOG = 'openaire';
	const CACHE_GROUP = 'openaire.search';
	const PUBLICATION_STATISTICS_CACHE_ID = 'statistics.publications';
	const DATASET_STATISTICS_CACHE_ID = 'statistics.datasets';
	const PROJECT_STATISTICS_CACHE_ID = 'statistics.projects';
	const PEOPLE_STATISTICS_CACHE_ID = 'statistics.people';
	const ORGANIZATION_STATISTICS_CACHE_ID = 'statistics.organizations';
	const DATASOURCE_STATISTICS_CACHE_ID = 'statistics.datasource';	
	const SEARCH_PUBLICATIONS_CACHE_ID = 'search.publications';
	const SEARCH_DATASETS_CACHE_ID = 'search.datasets';
	const SEARCH_PROJECTS_CACHE_ID = 'search.projects';
	const SEARCH_PEOPLE_CACHE_ID = 'search.people';
	const SEARCH_ORGANIZATIONS_CACHE_ID = 'search.organizations';
	const SEARCH_DATASOURCES_CACHE_ID = 'search.datasources';
	const BROWSE_PUBLICATIONS_CACHE_ID = 'browse.publications';
	const BROWSE_DATASETS_CACHE_ID = 'browse.datasets';
	const BROWSE_PROJECTS_CACHE_ID = 'browse.projects';
	const BROWSE_PEOPLE_CACHE_ID = 'browse.people';
	const BROWSE_ORGANIZATIONS_CACHE_ID = 'browse.organizations';
	const BROWSE_DATASOURCES_CACHE_ID = 'browse.datasources';
	const ADVANCED_SEARCH_PUBLICATIONS_CACHE_ID = 'advanced.publications';
	const ADVANCED_SEARCH_PROJECTS_CACHE_ID = 'advanced.projects';
	const ADVANCED_SEARCH_PEOPLE_CACHE_ID = 'advanced.people';
	const ADVANCED_SEARCH_ORGANIZATIONS_CACHE_ID = 'advanced.organizations';
	const ADVANCED_SEARCH_DATASOURCES_CACHE_ID = 'advanced.datasources';
	const RESULT_CACHE_ID = 'result';
	const PUBLICATION_CACHE_ID = 'publication';
	const DATASET_CACHE_ID = 'dataset';
	const PROJECT_CACHE_ID = 'project';
	const PROJECT_PUBLICATIONS_CACHE_ID = 'project.publications';
	const PERSON_CACHE_ID = 'person';
	const PERSON_PUBLICATIONS_CACHE_ID = 'person.publications';
	const ORGANIZATION_CACHE_ID = 'organization';
	const ORGANIZATION_DATASOURCES_CACHE_ID = 'organization.datasources';
	const DATASOURCE_CACHE_ID = 'datasource';
	const DATASOURCE_PUBLICATIONS_CACHE_ID = 'datasource.publications';
	const DATASOURCE_ORGANIZATIONS_CACHE_ID = 'datasource.organizations';
	const COMPATIBLE_DATASOURCES_CACHE_ID = 'compatible.datasources';
	const QUICK_SEARCH_PROJECTS_CACHE_ID = 'quick.search.projects';
	const QUICK_SEARCH_ORGANIZATIONS_CACHE_ID = 'quick.search.organizations';
	const RESULT_QUERY = '(oaftype exact result)';
	const RESULT_ID = 'objIdentifier';
	const PUBLICATION_QUERY = '(oaftype exact result) and (resulttypeid exact publication)';
	const PUBLICATION_TYPE = 'instancetypenameid';
	const PUBLICATION_LANGUAGE = 'resultlanguageid';
	const PUBLICATION_CONTEXT = 'contextid';
	const PUBLICATION_FUNDER = 'relfundinglevel0_id';
	const PUBLICATION_FUNDING_STREAM = 'relfundinglevel1_id';
	const PUBLICATION_SCIENTIFIC_AREA = 'relfundinglevel2_id';
	const PUBLICATION_YEAR = 'resultacceptanceyear';
	const PUBLICATION_ACCESS_MODE = 'resultbestlicense';
	const PUBLICATION_DATASOURCE = 'resulthostingdatasourceid';
	const PUBLICATION_PROJECT = 'relprojectid';
	const PUBLICATION_AUTHOR_ID = 'relpersonid';
	const PUBLICATION_ARTICLE = '0001';
	const PUBLICATION_PREPRINT = '0016';
	const PUBLICATION_BOOK = '0002';
	const PUBLICATION_BOOK_PART = '0013';
	const PUBLICATION_PHD_THESIS = '0006';
	const PUBLICATION_MASTER_THESIS = '0007';
	const PUBLICATION_BACHELOR_THESIS = '0008';
	const PUBLICATION_REPORT = '0017';
	const PUBLICATION_INTERNAL_REPORT = '0011';
	const PUBLICATION_EXTERNAL_REPORT = '0009';
	const PUBLICATION_TITLE = 'resulttitle';
	const PUBLICATION_AUTHOR = 'relperson';
	const PUBLICATION_PUBLISHER = 'resultpublisher';
	const PUBLICATION_SUBJECT = 'resultsubject';
	const PUBLICATION_DATE = 'resultdateofacceptance';
	const PUBLICATION_ID = 'objIdentifier';
	const DATASET_QUERY = '(oaftype exact result) and (resulttypeid exact dataset)';
	const DATASET_TYPE = 'instancetypenameid';
	const DATASET_LANGUAGE = 'resultlanguageid';
	const DATASET_FUNDER = 'relfundinglevel0_id';
	const DATASET_FUNDING_STREAM = 'relfundinglevel1_id';
	const DATASET_SCIENTIFIC_AREA = 'relfundinglevel2_id';
	const DATASET_YEAR = 'resultacceptanceyear';
	const DATASET_ACCESS_MODE = 'resultbestlicense';
	const DATASET_DATASOURCE = 'resulthostingdatasourceid';
	const DATASET_PROJECT = 'relprojectid';
	const DATASET_AUTHOR_ID = 'relpersonid';
	const DATASET_ID = 'objIdentifier';
	const PROJECT_QUERY = '(oaftype exact project)';
	const PROJECT_FUNDER = 'fundinglevel0_id';
	const PROJECT_FUNDING_STREAM = 'fundinglevel1_id';
	const PROJECT_SCIENTIFIC_AREA = 'fundinglevel2_id';
	const PROJECT_START_YEAR = 'projectstartyear';
	const PROJECT_END_YEAR = 'projectendyear';
	const PROJECT_SC39 = 'projectecsc39';
	const PROJECT_ACRONYM = 'projectacronym';
	const PROJECT_TITLE = 'projecttitle';
	const PROJECT_KEYWORDS = 'projectkeywords';
	const PROJECT_START_DATE = 'projectstartdate';
	const PROJECT_END_DATE = 'projectenddate';
	const PROJECT_ID = 'objIdentifier';
	const PROJECT_CODE = 'projectcode';
	const PERSON_QUERY = '(oaftype exact person)';
	const PERSON_COUNTRY = 'personcountryid';
	const PERSON_LAST_NAME = 'personsecondnames';
	const PERSON_FIRST_NAME = 'personfirstname';
	const PERSON_FULL_NAME = 'personfullname';
	const PERSON_ID = 'objIdentifier';
	const ORGANIZATION_QUERY = '(oaftype exact organization)';
	const ORGANIZATION_COUNTRY = 'organizationcountryid';
	const ORGANIZATION_LEGAL_BODY = 'organizationeclegalbody';
	const ORGANIZATION_LEGAL_PERSON = 'organizationeclegalperson';
	const ORGANIZATION_NON_PROFIT = 'organizationecnonprofit';
	const ORGANIZATION_RESEARCH = 'organizationecresearchorganization';
	const ORGANIZATION_EU_INTERESTS = 'organizationecinternationalorganizationeurinterests';
	const ORGANIZATION_INTERNATIONAL = 'organizationecinternationalorganization';
	const ORGANIZATION_ENTERPRISE = 'organizationecenterprise';
	const ORGANIZATION_SMALL_MEDIUM_ENTERPRISE = 'organizationecsmevalidated';
	const ORGANIZATION_NAME = 'organizationlegalname';
	const ORGANIZATION_SHORT_NAME = 'organizationlegalshortname';
	const ORGANIZATION_ID = 'objIdentifier';
	const DATASOURCE_QUERY = '(oaftype exact datasource) and (datasourcecompatibilityid <> "UNKNOWN")';
	const DATASOURCE_QUERY_COMPATIBILITY = '(oaftype exact datasource)';
	const DATASOURCE_TYPE = 'datasourcetypeuiid';
	const DATASOURCE_LANGUAGE = 'datasourceodlanguages';
	const DATASOURCE_CONTENT = 'datasourceodcontenttypes';
	const DATASOURCE_COMPATIBILITY = 'datasourcecompatibilityid';
	const DATASOURCE_NAME = 'datasourceofficialname';
	const DATASOURCE_ENGLISH_NAME = 'datasourceenglishname';
	const DATASOURCE_SUBJECT = 'datasourceodsubjects';
	const DATASOURCE_ORGANIZATION = 'relorganizationid';
	const DATASOURCE_ID = 'objIdentifier';
	const DATASOURCE_COMPATIBILITY_NOT_COMPATIBLE = 'notCompatible';
	const DATASOURCE_ACCESS_OPEN = 'OPEN';
	const DATASOURCE_ACCESS_EMBARGO = 'EMBARGO';
	const DATASOURCE_ACCESS_RESTRICTED = 'RESTRICTED';
	const DATASOURCE_ACCESS_CLOSED = 'CLOSED';
	const UNKNOWN = 'UNKNOWN';
	const UNDETERMINED = 'Undetermined';
	const PUBLICATION = 'publication';
	const DATASET = 'dataset';
	const HTTP_OK = 200;

	private $searchService;
	private $publicationStatisticsExistUrl;
	private $publicationStatisticsChartUrl;
	private $datasourceStatisticsExistUrl;
	private $datasourceStatisticsChartUrl;
	private $projectStatisticsChartUrl;
	private $cache;
	private $http;

	// Construct a new OpenAireModelSearch.
	// $configuration the configuration to use		
	public function __construct($configuration = array()) {
		parent :: __construct($configuration);
		$parameters = JComponentHelper :: getParams('com_openaire');
		$this -> searchService = $parameters -> get('searchServiceUrl');
		$this -> publicationStatisticsExistUrl = $parameters -> get('statisticsDocumentExistUrl');
		$this -> publicationStatisticsChartUrl = $parameters -> get('statisticsDocumentChartUrl');
		$this -> datasourceStatisticsExistUrl = $parameters -> get('statisticsRepositoryExistUrl');
		$this -> datasourceStatisticsChartUrl = $parameters -> get('statisticsRepositoryChartUrl');
		$this -> projectStatisticsChartUrl = $parameters -> get('statisticsProjectChartUrl');
		$this -> cache = JCache :: getInstance();
		$this -> http = new JHttp();
	}
	
	// Retrieve the statistics exist URL for a publication.
	// return the URL to use in order to check whether statistics exist for a publication
	public function getPublicationStatisticsExistUrl() {
		return $this -> publicationStatisticsExistUrl;
	}
	
	// Retrieve the statistics chart URL for a publication.
	// return the URL to use in order to retrieve statistics chart for a publication
	public function getPublicationStatisticsChartUrl() {
		return $this -> publicationStatisticsChartUrl;
	}

	// Retrieve the statistics exist URL for a datasource.
	// return the URL to use in order to check whether statistics exist for a datasource
	public function getDatasourceStatisticsExistUrl() {
		return $this -> datasourceStatisticsExistUrl;
	}
	
	// Retrieve the statistics chart URL for a datasource.
	// return the URL to use in order to retrieve statistics chart for a datasource
	public function getDatasourceStatisticsChartUrl() {
		return $this -> datasourceStatisticsChartUrl;
	}

	// Retrieve the statistics chart URL for a project.
	// return the URL to use in order to retrieve statistics chart for a project
	public function getProjectStatisticsChartUrl() {
		return $this -> projectStatisticsChartUrl;
	}
	
	// Retrieve publication statistics using cache if enabled.
	// $locale the locale to use
	// return statistics (object)
	public function getPublicationStatistics($locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: PUBLICATION_STATISTICS_CACHE_ID . '.' . $locale;
			$statistics = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($statistics === FALSE) {
				$statistics = $this -> _getPublicationStatistics($locale);
				if ($statistics !== NULL)
					$this -> cache -> store($statistics, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$statistics = $this -> _getPublicationStatistics($locale);
		return $statistics;
	}
	
	// Retrieve dataset statistics using cache if enabled.
	// $locale the locale to use
	// return statistics (object)
	public function getDatasetStatistics($locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: DATASET_STATISTICS_CACHE_ID . '.' . $locale;
			$statistics = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($statistics === FALSE) {
				$statistics = $this -> _getDatasetStatistics($locale);
				if ($statistics !== NULL)
					$this -> cache -> store($statistics, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$statistics = $this -> _getDatasetStatistics($locale);
		return $statistics;
	}
	
	// Retrieve project statistics using cache if enabled.
	// $locale the locale to use
	// return statistics (object)
	public function getProjectStatistics($locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: PROJECT_STATISTICS_CACHE_ID . '.' . $locale;
			$statistics = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($statistics === FALSE) {
				$statistics = $this -> _getProjectStatistics($locale);
				if ($statistics !== NULL)
					$this -> cache -> store($statistics, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$statistics = $this -> _getProjectStatistics($locale);
		return $statistics;
	}

	// Retrieve people statistics using cache if enabled.
	// $locale the locale to use
	// return statistics (object)
	public function getPeopleStatistics($locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: PEOPLE_STATISTICS_CACHE_ID . '.' . $locale;
			$statistics = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($statistics === FALSE) {
				$statistics = $this -> _getPeopleStatistics($locale);
				if ($statistics !== NULL)
					$this -> cache -> store($statistics, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$statistics = $this -> _getPeopleStatistics($locale);
		return $statistics;
	}
	
	// Retrieve organization statistics using cache if enabled.
	// $locale the locale to use
	// return statistics (object)
	public function getOrganizationStatistics($locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: ORGANIZATION_STATISTICS_CACHE_ID . '.' . $locale;
			$statistics = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($statistics === FALSE) {
				$statistics = $this -> _getOrganizationStatistics($locale);
				if ($statistics !== NULL)
					$this -> cache -> store($statistics, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$statistics = $this -> _getOrganizationStatistics($locale);
		return $statistics;
	}
	
	// Retrieve datasource statistics using cache if enabled.
	// $locale the locale to use
	// return statistics (object)
	public function getDatasourceStatistics($locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: DATASOURCE_STATISTICS_CACHE_ID . '.' . $locale;
			$statistics = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($statistics === FALSE) {
				$statistics = $this -> _getDatasourceStatistics($locale);
				if ($statistics !== NULL)
					$this -> cache -> store($statistics, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$statistics = $this -> _getDatasourceStatistics($locale);
		return $statistics;
	}
	
	// Perform a simple search for publications using cache if enabled.
	// $keyword the keyword to search for
	// $articles flag to limit searching on articles; if all flags are FALSE no limits apply
	// $books flag to limit searching on books; if all flags are FALSE no limits apply
	// $theses flag to limit searching on books; if all flags are FALSE no limits apply
	// $reports flag to limit searching on reports; if all flags are FALSE no limits apply
	// $type the ID of the publication type to use as filter or NULL for no publication type filtering
	// $language the ID of the language to use as filter or NULL for no language filtering
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the funding stream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $year the year of publication to use as filter or NULL for no year filtering
	// $accessMode the ID of the access mode to use as a filter or NULL for no access mode filtering
	// $datasource the ID of the datasource to use as filter or NULL for no datasource filtering
    // $community the ID of the community to use as filter or NULL for no community filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing publications and statistics
	public function searchPublications($keyword, $articles, $books, $theses, $reports, $type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $community, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: SEARCH_PUBLICATIONS_CACHE_ID . '.' . $keyword . '.' . $articles . '.' . $books . '.' . $theses . '.' . $reports . '.' . $type . '.' . $language . '.' . $funder . '.' . $fundingStream . '.' . $scientificArea . '.' . $year . '.' . $accessMode . '.' . $datasource . '.' . $community . '.' . $page . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _searchPublications($keyword, $articles, $books, $theses, $reports, $type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $community, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _searchPublications($keyword, $articles, $books, $theses, $reports, $type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $community, $page, $size, $locale);
		return $result;
	}
	
	// Perform a simple search for datasets using cache if enabled.
	// $keyword the keyword to search for
	// $type the ID of the dataset type to use as filter or NULL for no dataset type filtering
	// $language the ID of the language to use as filter or NULL for no language filtering
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the funding stream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $year the year of publication to use as filter or NULL for no year filtering
	// $accessMode the ID of the access mode to use as a filter or NULL for no access mode filtering
	// $datasource the ID of the datasource to use as filter or NULL for no datasource filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing datasets and statistics
	public function searchDatasets($keyword, $type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: SEARCH_DATASETS_CACHE_ID . '.' . $keyword . '.' . $type . '.' . $language . '.' . $funder . '.' . $fundingStream . '.' . $scientificArea . '.' . $year . '.' . $accessMode . '.' . $datasource . '.' . $page . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _searchDatasets($keyword, $type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _searchDatasets($keyword, $type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $page, $size, $locale);
		return $result;
	}
	
	// Perform a simple search for projects using cache if enabled.
	// $keyword the keyword to search for
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the funding stream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $startYear the start year to use as filter or NULL for no start year filtering
	// $endYear the end year to suse as filter or NULL for no end year filtering
	// $sc39 the SC-39 status to use as filter or NULL for no SC-39 status filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing projects and statistics
	public function searchProjects($keyword, $funder, $fundingStream, $scientificArea, $startYear, $endYear, $sc39, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: SEARCH_PROJECTS_CACHE_ID . '.' . $keyword . '.' . $funder . '.' . $fundingStream . '.' . $scientificArea . '.' . $startYear . '.' . $endYear . '.' . (($sc39 === NULL) ? '' : (($sc39) ? 'true' : 'false')) . '.' . $page . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _searchProjects($keyword, $funder, $fundingStream, $scientificArea, $startYear, $endYear, $sc39, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _searchProjects($keyword, $funder, $fundingStream, $scientificArea, $startYear, $endYear, $sc39, $page, $size, $locale);
		return $result;
	}			
	
	// Perform a simple search for people using cache if enabled.
	// $keyword the keyword to search for
	// $country the ID of the country to use as filter or NULL for no country filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing people and statistics
	public function searchPeople($keyword, $country, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: SEARCH_PEOPLE_CACHE_ID . '.' . $keyword . '.' . $country . '.' . $page . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _searchPeople($keyword, $country, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _searchPeople($keyword, $country, $page, $size, $locale);
		return $result;
	}
	
	// Perform a simple search for organizations using cache if enabled.
	// $keyword the keyword to search for
	// $country the ID of the country to use as filter or NULL for no country filtering
	// $type the ID of the organization type to use as filter or NULL for no organization type filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing organizations and statistics
	public function searchOrganizations($keyword, $country, $type, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: SEARCH_ORGANIZATIONS_CACHE_ID . '.' . $keyword . '.' . $country . '.' . $type . '.' . $page . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _searchOrganizations($keyword, $country, $type, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _searchOrganizations($keyword, $country, $type, $page, $size, $locale);
		return $result;
	}

	// Perform a simple search for datasources using cache if enabled.
	// $keyword the keyword to search for
	// $type the ID of the datasource type to use as filter or NULL for no datasource type filtering
	// $language ID of the datasource language to use as filter or NULL for no datasource language filtering
	// $content the ID of the content to use as filter or NULL for no project filtering
	// $compatibility the ID of the compatibility level to use as filter or NULL for no compatibility level filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing datasources and statistics
	public function searchDatasources($keyword, $type, $language, $content, $compatibility, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: SEARCH_DATASOURCES_CACHE_ID . '.' . $keyword . '.' . $type . '.' . $language . '.' . $content . '.' . $compatibility . '.' . $page . '.' . $size . '.' . $locale;			
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _searchDatasources($keyword, $type, $language, $content, $compatibility, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _searchDatasources($keyword, $type, $language, $content, $compatibility, $page, $size, $locale);
		return $result;
	}
	
	// Perform a browse for publications using cache if enabled.
	// $type the ID of the publication type to use as filter or NULL for no publication type filtering
	// $language the ID of the language to use as filter or NULL for no language filtering
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the funding stream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $year the year of publication to use as filter or NULL for no year filtering
	// $accessMode the ID of the access mode to use as filter or NULL for no access mode filtering
	// $datasource the ID of the datasource to use as filter or NULL for no datasource filtering
	// $community the ID of the community to use as filter or NULL for no datasource filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// $project the ID of the project to use as filter or NULL for no project filtering
	// $author the ID of the author to use as filter or NULL for no author filtering
	// return a result (object) containing publications and statistics
	public function browsePublications($type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $community, $page, $size, $locale, $project, $author) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: BROWSE_PUBLICATIONS_CACHE_ID . '.' . $type . '.' . $language . '.' . $funder . '.' . $fundingStream . '.' . $scientificArea . '.' . $year . '.' . $accessMode . '.' . $datasource . '.' . $community . '.' . $page . '.' . $size . '.' . $locale . '.' . $project . '.' . $author;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _browsePublications($type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $community, $page, $size, $locale, $project, $author);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _browsePublications($type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $community, $page, $size, $locale, $project, $author);
		return $result;
	}
	
	// Perform a browse for datasets using cache if enabled.
	// $type the ID of the dataset type to use as filter or NULL for no dataset type filtering
	// $language the ID of the language to use as filter or NULL for no language filtering
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the funding stream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $year the year of publication to use as filter or NULL for no year filtering
	// $accessMode the ID of the access mode to use as filter or NULL for no access mode filtering
	// $datasource the ID of the datasource to use as filter or NULL for no datasource filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// $project the ID of the project to use as filter or NULL for no project filtering
	// $author the ID of the author to use as filter or NULL for no author filtering
	// return a result (object) containing datasets and statistics
	public function browseDatasets($type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $page, $size, $locale, $project, $author) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: BROWSE_DATASETS_CACHE_ID . '.' . $type . '.' . $language . '.' . $funder . '.' . $fundingStream . '.' . $scientificArea . '.' . $year . '.' . $accessMode . '.' . $datasource . '.' . $page . '.' . $size . '.' . $locale . '.' . $project . '.' . $author;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _browseDatasets($type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $page, $size, $locale, $project, $author);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _browseDatasets($type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $page, $size, $locale, $project, $author);
		return $result;
	}
	
	// Perform a browse for projects using cache if enabled.
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the funding stream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $startYear the start year to use as filter or NULL for no start year filtering
	// $endYear the end year to use as filter or NULL for no end year filtering
	// $sc39 the SC-39 status to use as filter or NULL for no SC-39 status filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing projects and statistics
	public function browseProjects($funder, $fundingStream, $scientificArea, $startYear, $endYear, $sc39, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: BROWSE_PROJECTS_CACHE_ID . '.' . $funder . '.' . $fundingStream . '.' . $scientificArea . '.' . $startYear . '.' . '.' . $endYear . '.' . $sc39 . '.' .$page . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _browseProjects($funder, $fundingStream, $scientificArea, $startYear, $endYear, $sc39, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _browseProjects($funder, $fundingStream, $scientificArea, $startYear, $endYear, $sc39, $page, $size, $locale);
		return $result;
	}

	// Perform a browse for people using cache if enabled.
	// $country the ID of the country to use as filter or NULL for no country filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing people and statistics
	public function browsePeople($country, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: BROWSE_PEOPLE_CACHE_ID . '.' . $country . '.' . $page . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _browsePeople($country, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _browsePeople($country, $page, $size, $locale);
		return $result;
	}
	
	// Perform a browse for organizations using cache if enabled.
	// $country the ID of the country to use as filter or NULL for no country filtering
	// $type the ID of the organization type to use as filter or NULL for no organization type filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing organizations and statistics
	public function browseOrganizations($country, $type, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: BROWSE_ORGANIZATIONS_CACHE_ID . '.' . $country . '.' . $type . '.' . $page . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _browseOrganizations($country, $type, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _browseOrganizations($country, $type, $page, $size, $locale);
		return $result;
	}
	
	// Perform a browse for datasources using cache if enabled.
	// $type the ID of the datasource type to use as filter or NULL for no datasource type filtering
	// $language the ID of the datasource language to use as filter or NULL for no datasource language filtering
	// $content the ID of the content to use as filter or NULL for no content filtering
	// $compatibility the ID of the compatibility level to use as filter or NULL for no compatibility status filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing datasources and statistics
	public function browseDatasources($type, $language, $content, $compatibility, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: BROWSE_DATASOURCES_CACHE_ID . '.' . $type . '.' . $language . '.' . $content . '.' . $compatibility . '.' . $page . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _browseDatasources($type, $language, $content, $compatibility, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _browseDatasources($type, $language, $content, $compatibility, $page, $size, $locale);
		return $result;
	}
		
	// Perform an advanced search for publications using cache if enabled.
	// $keywords the keywords to search for (array)
	// $fields the fields to match keywords with (array - possible values are TITLE, AUTHOR, PUBLISHER and SUBJECT)
	// $constraints the constraints to apply to keywords (array - possible values are ALL and ANY)
	// $types the IDs of the publication types to search for
	// $languages the IDs of the publication languages to search for
	// $funders the IDs of the funders to search for
	// $fundingStreams the IDs of the funding streams to search for
	// $scientificAreas the IDs of the scientific areas to search for
	// $date the publication date range to search for expressed in months before current date (if -1 search for any publication date, if 0 search explicitly using $fromMonth, $fromYear, $toMonth and $toYear)
	// $fromMonth start month of the publication date range to search for if $date has value 0
	// $fromYear start year of the publication date range to search for if $date has value 0
	// $toMonth end month of the publication date range to search for if $date has value 0
	// $toYear end year of the publication date range to search for if $date has value 0
	// $accessModes the IDs of the access modes to search for
	// $datasources the IDs of the datasources to search for
	// $type the ID of the publication type to use as filter or NULL for no publication type filtering
	// $language the ID of the publication language to use as filter or NULL for no publication language filtering
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the funding stream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $year the publication year to use as filter or NULL for no publication year filtering
	// $accessMode the ID of the access mode to use as filter or NULL for no access mode filtering
	// $datasource the ID of the datasource to use as filter or NULL for no datasource filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing publications and statistics
	public function advancedSearchPublications($keywords, $fields, $constraints, $types, $languages, $funders, $fundingStreams, $scientificAreas, $date, $fromMonth, $fromYear, $toMonth, $toYear, $accessModes, $datasources, $type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: ADVANCED_SEARCH_PUBLICATIONS_CACHE_ID . '.' . implode('.', $keywords) . '.' . implode('.', $fields) . '.' . implode('.', $constraints) . '.' . implode('.', $types) . '.' . implode('.', $languages) . '.' . implode('.', $funders) . '.' . implode('.', $fundingStreams) . '.' . implode('.', $scientificAreas) . '.' . $date . '.' . $fromMonth . '.' . $fromYear . '.' . $toMonth . '.' . $toYear . '.' . implode('.', $accessModes) . '.' . implode('.', $datasources) . '.' . $type . '.' . $language . '.' . $funder . '.' . $fundingStream . '.' . $scientificArea . '.' . $year . '.' . $accessMode . '.' . $datasource . '.' . $page . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _advancedSearchPublications($keywords, $fields, $constraints, $types, $languages, $funders, $fundingStreams, $scientificAreas, $date, $fromMonth, $fromYear, $toMonth, $toYear, $accessModes, $datasources, $type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _advancedSearchPublications($keywords, $fields, $constraints, $types, $languages, $funders, $fundingStreams, $scientificAreas, $date, $fromMonth, $fromYear, $toMonth, $toYear, $accessModes, $datasources, $type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $page, $size, $locale);
		return $result;
	}
	
	// Perform an advanced search for projects using cache if enabled.
	// $keywords the keywords to search for (array)
	// $fields the fields to match keywords with (array - possible values are ACRONYM, TITLE and KEYWORDS)
	// $constraints the constraints to apply to keywords (array - possible values are ALL and ANY)
	// $funders the IDs of the funders to search for
	// $fundingStreams the IDs of the funding streams to search for
	// $scientificAreas the IDs of the scientific areas to search for
	// $startDate the start date range to search for expressed in months before current date (if -1 search for any start date, if 0 search explicitly using $startFromMonth, $startFromYear, $startToMonth and $startToYear)
	// $startFromMonth start month of the start date range to search for if $startDate has value 0
	// $startFromYear start year of the start date range to search for if $startDate has value 0
	// $startToMonth end month of the start date range to search for if $startDate has value 0
	// $startToYear end year of the start date range to search for if $startDate has value 0
	// $endDate the end date range to search for expressed in months before current date (if -1 search for any end date, if 0 search explicitly using $endFromMonth, $endFromYear, $endToMonth and $endToYear)
	// $endFromMonth start month of the end date range to search for if $endDate has value 0
	// $endFromYear start year of the end date range to search for if $endDate has value 0
	// $endToMonth end month of the end date range to search for if $endDate has value 0
	// $endToYear end year of the end date range to search for if $endDate has value 0
	// $sc39 the SC-39 statuses to search for
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the funding stream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $startYear the start year to use as filter or NULL for no start year filtering
	// $endYear the end year to use as filter or NULL for no end year filtering	
	// $accessMode the ID of the SC-39 status to use as filter or NULL for no SC-39 status filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing projects and statistics
	public function advancedSearchProjects($keywords, $fields, $constraints, $funders, $fundingStreams, $scientificAreas, $startDate, $startFromMonth, $startFromYear, $startToMonth, $startToYear, $endDate, $endFromMonth, $endFromYear, $endToMonth, $endToYear, $sc39s, $funder, $fundingStream, $scientificArea, $startYear, $endYear, $sc39, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: ADVANCED_SEARCH_PROJECTS_CACHE_ID . '.' . implode('.', $keywords) . '.' . implode('.', $fields) . '.' . implode('.', $constraints) . '.' . implode('.', $funders) . '.' . implode('.', $fundingStreams) . '.' . implode('.', $scientificAreas) . '.' . $startDate . '.' . $startFromMonth . '.' . $startFromYear . '.' . $startToMonth . '.' . $startToYear . '.' . $endDate . '.' . $endFromMonth . '.' . $endFromYear . '.' . $endToMonth . '.' . $endToYear . '.' . implode('.', array_map(function ($sc39) {return $sc39 ? 'true' : 'false';}, $sc39s)) . '.' . $funder . '.' . $fundingStream . '.' . $scientificArea . '.' . $startYear . '.' . $endYear . '.' . (($sc39 === NULL) ? '' : ($sc39 ? 'true' : 'false')) . '.' . $page . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _advancedSearchProjects($keywords, $fields, $constraints, $funders, $fundingStreams, $scientificAreas, $startDate, $startFromMonth, $startFromYear, $startToMonth, $startToYear, $endDate, $endFromMonth, $endFromYear, $endToMonth, $endToYear, $sc39s, $funder, $fundingStream, $scientificArea, $startYear, $endYear, $sc39, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _advancedSearchProjects($keywords, $fields, $constraints, $funders, $fundingStreams, $scientificAreas, $startDate, $startFromMonth, $startFromYear, $startToMonth, $startToYear, $endDate, $endFromMonth, $endFromYear, $endToMonth, $endToYear, $sc39s, $funder, $fundingStream, $scientificArea, $startYear, $endYear, $sc39, $page, $size, $locale);
		return $result;
	}
	
	// Perform an advanced search for people using cache if enabled.
	// $keywords the keywords to search for (array)
	// $fields the fields to match keywords with (array - possible values are LAST_NAME, FIRST_NAME and FULL_NAME) 
	// $constraints the constraints to apply to keywords (array - possible values are ALL and ANY)
	// $countries the IDs of the countries to search for
	// $country the ID of the coutnry to use as filter or NULL for no country filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing people and statistics
	public function advancedSearchPeople($keywords, $fields, $constraints, $countries, $country, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: ADVANCED_SEARCH_PEOPLE_CACHE_ID . '.' . implode('.', $keywords) . '.' . implode('.', $fields) . '.' . implode('.', $constraints) . '.' . implode('.', $countries) . '.' . $country . '.' . $page . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _advancedSearchPeople($keywords, $fields, $constraints, $countries, $country, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _advancedSearchPeople($keywords, $fields, $constraints, $countries, $country, $page, $size, $locale);
		return $result;
	}
	
	// Perform an advanced search for organizations using cache if enabled.
	// $keywords the keywords to search for (array)
	// $fields the fields to match keywords with (array - possible values are NAME and SHORT_NAME)
	// $constraints the constraints to apply to keywords (array - possible values are ALL and ANY)
	// $countries the IDs of the countries to search for
	// $types the IDs of the organization types to search for
	// $country the ID of the country to use as filter or NULL for no country filtering
	// $type the ID of the organization type to use as filter or NULL for no organization type filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing people and statistics	
	public function advancedSearchOrganizations($keywords, $fields, $constraints, $countries, $types, $country, $type, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: ADVANCED_SEARCH_ORGANIZATIONS_CACHE_ID . '.' . implode('.', $keywords) . '.' . implode('.', $fields) . '.' . implode('.', $constraints) . '.' . implode('.', $countries) . '.' . implode('.', $types) . $country . '.' . $type . '.' . $page . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _advancedSearchOrganizations($keywords, $fields, $constraints, $countries, $types, $country, $type, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _advancedSearchOrganizations($keywords, $fields, $constraints, $countries, $types, $country, $type, $page, $size, $locale);
		return $result;
	}
	
	// Perform an advanced search for datasources using cache if enabled.
	// $keywords the keywords to search for (array)
	// $fields the fields to match keywords with (array - possible values are NAME, ENGLISH_NAME and SUBJECT)
	// $constraints the constraints to apply to keywords (array - possible values are ALL and ANY)
	// $types the IDs of the datasource types to search for
	// $languages the IDs of the datasource languages to search for
	// $contents the IDs of the contents to search for
	// $compatibilities the IDs of the compatibilities to search for
	// $type the ID of the datasource type to use as filter or NULL for no datasource type filtering
	// $language the ID of the datasource language to use as filter or NULL for no datasource language filtering
	// $content the ID of the content to use as filter or NULL for no content filtering
	// $compatibility the ID of the compatibility to use as filter or NULL for no compatibility filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing datasources and statistics
	public function advancedSearchDatasources($keywords, $fields, $constraints, $types, $languages, $contents, $compatibilities, $type, $language, $content, $compatibility, $page, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: ADVANCED_SEARCH_DATASOURCES_CACHE_ID . '.' . implode('.', $keywords) . '.' . implode('.', $fields) . '.' . implode('.', $constraints) . '.' . implode('.', $types) . '.' . implode('.', $languages) . '.' . implode('.', $contents) . '.' . implode('.', $compatibilities) . '.' . $type . '.' . $language . '.' . $content . '.' . $compatibility . '.' . $page . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _advancedSearchDatasources($keywords, $fields, $constraints, $types, $languages, $contents, $compatibilities, $type, $language, $content, $compatibility, $page, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _advancedSearchDatasources($keywords, $fields, $constraints, $types, $languages, $contents, $compatibilities, $type, $language, $content, $compatibility, $page, $size, $locale);
		return $result;
	}
	
	// Retrieve a single publication by identifier using caching if enabled.
	// $id the publication identifier
	// $locale the locale to use
	// return a publication (object) or NULL if no such publication exists
	public function getPublication($id, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: PUBLICATION_CACHE_ID . '.' . $id . '.' . $locale;
			$publication = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($publication === FALSE) {
				$publication = $this -> _getPublication($id, $locale);
				if ($publication !== NULL)
					$this -> cache -> store($publication, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$publication = $this -> _getPublication($id, $locale);
		return $publication;
	}
        // Retrieve a single publication by identifier using caching if enabled.
	// $ids the publication identifiers
	// $locale the locale to use
	// return a publication (object) or NULL if no such publication exists
	public function getResults($ids, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: RESULTS_CACHE_ID . '.' . join(",",$ids) . '.' . $locale;
			$results = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($results === FALSE) {
				$results = $this -> _getResults($ids, $locale);
				if ($results !== NULL)
					$this -> cache -> store($results, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$results = $this -> _getResults($ids, $locale);
		return $results;
	}
	// Retrieve a single publication by identifier using caching if enabled.
	// $ids the publication identifiers
	// $locale the locale to use
	// return a publication (object) or NULL if no such publication exists
	public function getPublications($ids, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: PUBLICATION_CACHE_ID . '.' . join(",",$ids) . '.' . $locale;
			$publications = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($publications === FALSE) {
				$publications = $this -> _getPublications($ids, $locale);
				if ($publications !== NULL)
					$this -> cache -> store($publications, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$publications = $this -> _getPublications($ids, $locale);
		return $publications;
	}
        // Retrieve a single dataset by identifier using caching if enabled.
	// $ids the dataset identifiers
	// $locale the locale to use
	// return a publication (object) or NULL if no such publication exists
	public function getDatasets($ids, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: DATASET_CACHE_ID . '.' . join(",",$ids) . '.' . $locale;
			$datasets = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($datasets === FALSE) {
				$datasets = $this -> _getDatasets($ids, $locale);
				if ($datasets !== NULL)
					$this -> cache -> store($datasets, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$publications = $this -> _getDatasets($ids, $locale);
		return $publications;
	}
        // Retrieve projects by identifier using caching if enabled.
	// $ids the project identifiers
	// $locale the locale to use
	// return an array of project (object) or NULL if no such projects exists
	public function getProjects($ids, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: PROJECT_CACHE_ID . '.' . join(",",$ids) . '.' . $locale;
			$projects = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($projects === FALSE) {
				$projects = $this -> _getProjects($ids, $locale);
				if ($projects !== NULL)
					$this -> cache -> store($projects, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$projects = $this -> _getProjects($ids, $locale);
		return $projects;
	}
	// Retrieve a single dataset by identifier using caching if enabled.
	// $id the dataset identifier
	// $locale the locale to use
	// return a dataset (object) or NULL if no such dataset exists
	public function getDataset($id, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: DATASET_CACHE_ID . '.' . $id . '.' . $locale;
			$dataset = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($dataset === FALSE) {
				$dataset = $this -> _getDataset($id, $locale);
				if ($dataset !== NULL)
					$this -> cache -> store($dataset, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$dataset = $this -> _getDataset($id, $locale);
		return $dataset;
	}
	
	// Retrieve a single project by identifier using caching if enabled.
	// $id the project identifier
	// $locale the locale to use
	// return a project (object) or NULL if no such project exists
	public function getProject($id, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: PROJECT_CACHE_ID . '.' . $id . '.' . $locale;
			$project = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($project === FALSE) {
				$project = $this -> _getProject($id, $locale);
				if ($project !== NULL)
					$this -> cache -> store($project, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$project = $this -> _getProject($id, $locale);
		return $project;
	}
	
	// Retrieve a single person by identifier using caching if enabled.
	// $id the person identifier
	// $locale the locale to use
	// return a person (object) or NULL if no such person exists
	public function getPerson($id, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: PERSON_CACHE_ID . '.' . $id . '.' . $locale;
			$person = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($person === FALSE) {
				$person = $this -> _getPerson($id, $locale);
				if ($person !== NULL)
					$this -> cache -> store($person, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$person = $this -> _getPerson($id, $locale);
		return $person;
	}
	
	// Retreive a single organization by identifier using cache if enabled.
	// $id the organization identifier
	// $locale the locale to use
	// return an organization (object) or NULL if no such organization exists
	public function getOrganization($id, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: ORGANIZATION_CACHE_ID . '.' . $id . '.' . $locale;
			$organization = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($organization === FALSE) {
				$organization = $this -> _getOrganization($id, $locale);
				if ($organization !== NULL)
					$this -> cache -> store($organization, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$organization = $this -> _getOrganization($id, $locale);
		return $organization;
	}
	
	// Retrieve the datasources of an organization using caching if enabled.
	// $id the organization identifier
	// $size the maximum number of organizations to retrieve
	// $locale the locale to use
	// return a result (object) containing datasources and total
	public function getOrganizationDatasources($id, $size, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: ORGANIZATION_DATASOURCES_CACHE_ID . '.' . $id . '.' . $size . '.' . $locale;
			$result = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($result === FALSE) {
				$result = $this -> _getOrganizationDatasources($id, $size, $locale);
				if ($result !== NULL)
					$this -> cache -> store($result, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$result = $this -> _getOrganizationDatasources($id, $size, $locale);
		return $result;
	}
	
	// Retrieve a single datasource by identifier using cache if enabled.
	// $id the datasource identifier
	// $locale the locale to use
	// return a datasource (object) or NULL if no such datasource exists
	public function getDatasource($id, $locale, $compatibility = false) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: DATASOURCE_CACHE_ID . '.' . $id . '.' . $locale . "." . $compatibility;
			$datasource = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($datasource === FALSE) {
				$datasource = $this -> _getDatasource($id, $locale, $compatibility);
				if ($datasource !== NULL)
					$this -> cache -> store($datasource, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$datasource = $this -> _getDatasource($id, $locale, $compatibility);
		return $datasource;
	}
	
	// Retrieve all the OpenAIRE compatible datasources using cache if enabled.
	// $locale the locale to use
	// return the datasources (array) or NULL if any errors occur
	public function getCompatibleDatasources($locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: COMPATIBLE_DATASOURCES_CACHE_ID . '.' . $locale;
			$datasources = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($datasources === FALSE) {
				$datasources = $this -> _getCompatibleDatasources($locale);
				if ($datasources !== NULL)
					$this -> cache -> store($datasources, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$datasources = $this -> _getCompatibleDatasources($locale);
		return $datasources;
	}
	
	// Perform a quick search for projects, searching only by acronym, title or code and funder and using cahce if enabled.
	// $keyword the keyword to search for
	// $funder the funder to search for
	// $limit the maximum number of results to retrieve
	// $locale the locale to use
	// return projects (array) or NULL if any errors occur
	public function quickSearchProjects($keyword, $funder, $limit, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: QUICK_SEARCH_PROJECTS_CACHE_ID . '.' . $keyword . '.' . $funder . '.' . $limit . '.' . $locale;
			$projects = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($projects === FALSE) {
				$projects = $this -> _quickSearchProjects($keyword, $funder, $limit, $locale);
				if ($projects !== NULL)
					$this -> cache -> store($projects, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$projects = $this -> _quickSearchProjects($keyword, $funder, $limit, $locale);
		return $projects;
	}
	
	// Perform a quick search for organizations, searching only by name or short name and using cache if enabled.
	// $keyword the keyword to search for
	// $limit the maximum number of results to retrieve
	// $locale the locale to use
	// return organizations (array) or NULL if any errors occur
	public function quickSearchOrganizations($keyword, $limit, $locale) {
		if ($this -> cache -> getCaching()) {
			$cacheId = self :: QUICK_SEARCH_ORGANIZATIONS_CACHE_ID . '.' . $keyword . '.' . $limit . '.' . $locale;
			$organizations = $this -> cache -> get($cacheId, self :: CACHE_GROUP);
			if ($organizations === FALSE) {
				$organizations = $this -> _quickSearchOrganizations($keyword, $limit, $locale);
				if ($organizations !== NULL)
					$this -> cache -> store($organizations, $cacheId, self :: CACHE_GROUP);
			}
		} else
			$organizations = $this -> _quickSearchOrganizations($keyword, $limit, $locale);
		return $organizations;
	}
	
	// Retrieve publication statistics.
	// $locale the locale to use
	// return statistics (object)
	private function _getPublicationStatistics($locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PUBLICATION_QUERY;
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=refine&rTransformer=results_openaire_browse&fields=' . self :: PUBLICATION_TYPE . '&fields=' . self :: PUBLICATION_LANGUAGE . '&fields=' . self :: PUBLICATION_CONTEXT . '&fields=' . self :: PUBLICATION_FUNDER . '&fields=' . self :: PUBLICATION_FUNDING_STREAM . '&fields=' . self :: PUBLICATION_SCIENTIFIC_AREA . '&fields=' . self :: PUBLICATION_YEAR . '&fields=' . self :: PUBLICATION_ACCESS_MODE . '&fields=' . self :: PUBLICATION_DATASOURCE .'&fields=' . self :: PUBLICATION_CONTEXT . '&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$statistics = $this -> createStatistics($xpath, array('type', 'languageFilter', 'funder', 'fundingStream', 'scientificArea', 'year', 'accessMode', 'datasource', 'community'), array('DOCUMENT_TYPE', 'DOCUMENT_LANGUAGE', 'FUNDER', 'FUNDING_STREAM', 'SCIENTIFIC_AREA', 'PUBLICATION_YEAR', 'ACCESS_MODE', 'DATASOURCE', 'CONTEXT'), array('NO_DOCUMENT_TYPE_STATISTICS_FOUND', 'NO_DOCUMENT_LANGUAGE_STATISTICS_FOUND',
			 'NO_FUNDER_STATISTICS_FOUND', 'NO_FUNDING_STREAM_STATISTICS_FOUND', 'NO_SCIENTIFIC_AREA_STATISTICS_FOUND', 'NO_PUBLICATION_YEAR_STATISTICS_FOUND', 'NO_ACCESS_MODE_STATISTICS_FOUND', 'NO_DATASOURCE_STATISTICS_FOUND', 'NO_CONTEXT_STATISTICS_FOUND'), array(self :: PUBLICATION_TYPE, self :: PUBLICATION_LANGUAGE, self :: PUBLICATION_FUNDER, self :: PUBLICATION_FUNDING_STREAM, self :: PUBLICATION_SCIENTIFIC_AREA, self :: PUBLICATION_YEAR, self :: PUBLICATION_ACCESS_MODE, self :: PUBLICATION_DATASOURCE, self :: PUBLICATION_CONTEXT));
			JLog :: add('Retrieved publication statistics in ' . (microtime(TRUE) - $time) . ' s (locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $statistics;
		} catch (Exception $e) {
			JLog :: add('Error retrieving publication statistics (locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Retrieve dataset statistics.
	// $locale the locale to use
	// return statistics (object)
	private function _getDatasetStatistics($locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: DATASET_QUERY;
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=refine&rTransformer=results_openaire_browse&fields=' . self :: DATASET_TYPE . '&fields=' . self :: DATASET_LANGUAGE . '&fields=' . self :: DATASET_FUNDER . '&fields=' . self :: DATASET_FUNDING_STREAM . '&fields=' . self :: DATASET_SCIENTIFIC_AREA . '&fields=' . self :: DATASET_YEAR . '&fields=' . self :: DATASET_ACCESS_MODE . '&fields=' . self :: DATASET_DATASOURCE . '&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$statistics = $this -> createStatistics($xpath, array('type', 'languageFilter', 'funder', 'fundingStream', 'scientificArea', 'year', 'accessMode', 'datasource'), array('DATASET_TYPE', 'DATASET_LANGUAGE', 'FUNDER', 'FUNDING_STREAM', 'SCIENTIFIC_AREA', 'PUBLICATION_YEAR', 'ACCESS_MODE', 'DATASOURCE'), array('NO_DATASET_TYPE_STATISTICS_FOUND', 'NO_DATASET_LANGUAGE_STATISTICS_FOUND', 'NO_FUNDER_STATISTICS_FOUND', 'NO_FUNDING_STREAM_STATISTICS_FOUND', 'NO_SCIENTIFIC_AREA_STATISTICS_FOUND', 'NO_PUBLICATION_YEAR_STATISTICS_FOUND', 'NO_ACCESS_MODE_STATISTICS_FOUND', 'NO_DATASOURCE_STATISTICS_FOUND'), array(self :: DATASET_TYPE, self :: DATASET_LANGUAGE, self :: DATASET_FUNDER, self :: DATASET_FUNDING_STREAM, self :: DATASET_SCIENTIFIC_AREA, self :: DATASET_YEAR, self :: DATASET_ACCESS_MODE, self :: DATASET_DATASOURCE));
			JLog :: add('Retrieved dataset statistics in ' . (microtime(TRUE) - $time) . ' s (locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $statistics;
		} catch (Exception $e) {
			JLog :: add('Error retrieving dataset statistics (locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Retrieve project statistics.
	// $locale the locale to use
	// return statistics (object)
	private function _getProjectStatistics($locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PROJECT_QUERY;
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=refine&rTransformer=results_openaire_browse&fields=' . self :: PROJECT_FUNDER . '&fields=' . self :: PROJECT_FUNDING_STREAM . '&fields=' . self :: PROJECT_SCIENTIFIC_AREA . '&fields=' . self :: PROJECT_START_YEAR . '&fields=' . self :: PROJECT_END_YEAR . '&fields=' . self :: PROJECT_SC39 . '&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$statistics = $this -> createStatistics($xpath, array('funder', 'fundingStream', 'scientificArea', 'startYear', 'endYear', 'sc39'), array('FUNDER', 'FUNDING_STREAM', 'SCIENTIFIC_AREA', 'START_YEAR', 'END_YEAR', 'SPECIAL_CLAUSE_39'), array('NO_FUNDER_STATISTICS_FOUND', 'NO_FUNDING_STREAM_STATISTICS_FOUND', 'NO_SCIENTIFIC_AREA_STATISTICS_FOUND', 'NO_START_YEAR_STATISTICS_FOUND', 'NO_END_YEAR_STATISTICS_FOUND', 'NO_SPECIAL_CLAUSE_39_STATISTICS_FOUND'), array(self :: PROJECT_FUNDER, self :: PROJECT_FUNDING_STREAM, self :: PROJECT_SCIENTIFIC_AREA, self :: PROJECT_START_YEAR, self :: PROJECT_END_YEAR, self :: PROJECT_SC39));
			JLog :: add('Retrieved project statistics in ' . (microtime(TRUE) - $time) . ' s (locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $statistics;
		} catch (Exception $e) {
			JLog :: add('Error retrieving project statistics (locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
		
	// Retrieve people statistics.
	// $locale the locale to use
	// return statistics (object)
	private function _getPeopleStatistics($locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PERSON_QUERY;
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=refine&rTransformer=results_openaire_browse&fields=' . self :: PERSON_COUNTRY . '&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$statistics = $this -> createStatistics($xpath, array('country'), array('COUNTRY'), array('NO_COUNTRY_STATISTICS_FOUND'), array(self :: PERSON_COUNTRY));
			JLog :: add('Retrieved people statistics in ' . (microtime(TRUE) - $time) . ' s (locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $statistics;
		} catch (Exception $e) {
			JLog :: add('Error retrieving people statistics (locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}

	// Retrieve organization statistics.
	// $locale the locale to use
	// return statistics (object)
	private function _getOrganizationStatistics($locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: ORGANIZATION_QUERY;
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=refine&rTransformer=results_openaire_browse&fields=' . self :: ORGANIZATION_COUNTRY . '&fields=' . self :: ORGANIZATION_LEGAL_BODY . '&fields=' . self :: ORGANIZATION_LEGAL_PERSON . '&fields=' . self :: ORGANIZATION_NON_PROFIT . '&fields=' . self :: ORGANIZATION_RESEARCH . '&fields=' . self :: ORGANIZATION_EU_INTERESTS . '&fields=' . self :: ORGANIZATION_INTERNATIONAL . '&fields=' . self :: ORGANIZATION_ENTERPRISE . '&fields=' . self :: ORGANIZATION_SMALL_MEDIUM_ENTERPRISE . '&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$statistics = $this -> createStatistics($xpath, array('country'), array('COUNTRY'), array('NO_COUNTRY_STATISTICS_FOUND'), array(self :: ORGANIZATION_COUNTRY));
			$statistics['type'] = new JObject();
			$statistics['type'] -> id = 'type';
			$statistics['type'] -> title = JText :: _('ORGANIZATION_TYPE');
			$statistics['type'] -> error = JText :: _('NO_ORGANIZATION_TYPE_STATISTICS_FOUND');
			$statistics['type'] -> data = array();
			$legalBody = $this -> parseStatistics($xpath, self :: ORGANIZATION_LEGAL_BODY);
			if (($legalBody != NULL) && array_key_exists('true', $legalBody)) {
				$statistics['type'] -> data['legalBody'] = new JObject();
				$statistics['type'] -> data['legalBody'] -> id = 'legalBody';
				$statistics['type'] -> data['legalBody'] -> name = JText :: _('LEGAL_BODY');
				$statistics['type'] -> data['legalBody'] -> count = $legalBody['true'] -> count;
			}
			$legalPerson = $this -> parseStatistics($xpath, self :: ORGANIZATION_LEGAL_PERSON);
			if (($legalPerson != NULL) && array_key_exists('true', $legalPerson)) {
				$statistics['type'] -> data['legalPerson'] = new JObject();
				$statistics['type'] -> data['legalPerson'] -> id = 'legalPerson';
				$statistics['type'] -> data['legalPerson'] -> name = JText :: _('LEGAL_PERSON');
				$statistics['type'] -> data['legalPerson'] -> count = $legalPerson['true'] -> count;
			}
			$nonProfit = $this -> parseStatistics($xpath, self :: ORGANIZATION_NON_PROFIT);
			if (($nonProfit != NULL) && array_key_exists('true', $nonProfit)) {
				$statistics['type'] -> data['nonProfit'] = new JObject();
				$statistics['type'] -> data['nonProfit'] -> id = 'nonProfit';
				$statistics['type'] -> data['nonProfit'] -> name = JText :: _('NON_PROFIT_ORGANIZATION');
				$statistics['type'] -> data['nonProfit'] -> count = $nonProfit['true'] -> count;
			}
			$research = $this -> parseStatistics($xpath, self :: ORGANIZATION_RESEARCH);
			if (($research != NULL) && array_key_exists('true', $research)) {
				$statistics['type'] -> data['research'] = new JObject();
				$statistics['type'] -> data['research'] -> id = 'research';
				$statistics['type'] -> data['research'] -> name = JText :: _('RESEARCH_ORGANIZATION');
				$statistics['type'] -> data['research'] -> count = $research['true'] -> count;
			}			
			$euInterests = $this -> parseStatistics($xpath, self :: ORGANIZATION_EU_INTERESTS);
			if (($euInterests != NULL) && array_key_exists('true', $euInterests)) {
				$statistics['type'] -> data['euInterests'] = new JObject();
				$statistics['type'] -> data['euInterests'] -> id = 'euInterests';
				$statistics['type'] -> data['euInterests'] -> name = JText :: _('EU_INTERESTS_ORGANIZATION');
				$statistics['type'] -> data['euInterests'] -> count = $euInterests['true'] -> count;
			}
			$international = $this -> parseStatistics($xpath, self :: ORGANIZATION_INTERNATIONAL);
			if (($international != NULL) && array_key_exists('true', $international)) {
				$statistics['type'] -> data['international'] = new JObject();
				$statistics['type'] -> data['international'] -> id = 'international';
				$statistics['type'] -> data['international'] -> name = JText :: _('INTERNATIONAL_ORGANIZATION');
				$statistics['type'] -> data['international'] -> count = $international['true'] -> count;
			}
			$enterprise = $this -> parseStatistics($xpath, self :: ORGANIZATION_ENTERPRISE);
			if (($enterprise != NULL) && array_key_exists('true', $enterprise)) {
				$statistics['type'] -> data['enterprise'] = new JObject();
				$statistics['type'] -> data['enterprise'] -> id = 'enterprise';
				$statistics['type'] -> data['enterprise'] -> name = JText :: _('ENTERPRISE');
				$statistics['type'] -> data['enterprise'] -> count = $enterprise['true'] -> count;
			}
			$smallMediumEnterprise = $this -> parseStatistics($xpath, self :: ORGANIZATION_SMALL_MEDIUM_ENTERPRISE);
			if (($smallMediumEnterprise != NULL) && array_key_exists('true', $smallMediumEnterprise)) {
				$statistics['type'] -> data['smallMediumEnterprise'] = new JObject();
				$statistics['type'] -> data['smallMediumEnterprise'] -> id = 'smallMediumEnterprise';
				$statistics['type'] -> data['smallMediumEnterprise'] -> name = JText :: _('SMALL_MEDIUM_ENTERPRISE');
				$statistics['type'] -> data['smallMediumEnterprise'] -> count = $smallMediumEnterprise['true'] -> count;
			}
			uasort($statistics['type'] -> data, function ($row1, $row2) {return $row2 -> count - $row1 -> count;});
			JLog :: add('Retrieved organization statistics in ' . (microtime(TRUE) - $time) . ' s (locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $statistics;
		} catch (Exception $e) {
			JLog :: add('Error retrieving organization statistics (locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}

	// Retrieve datasource statistics.
	// $locale the locale to use
	// return statistics (object)
	private function _getDatasourceStatistics($locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: DATASOURCE_QUERY;
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=refine&rTransformer=results_openaire_browse&fields=' . self :: DATASOURCE_TYPE . '&fields=' . self :: DATASOURCE_LANGUAGE . '&fields=' . self :: DATASOURCE_CONTENT . '&fields=' . self :: DATASOURCE_COMPATIBILITY . '&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$statistics = $this -> createStatistics($xpath, array('type', 'languageFilter', 'content', 'compatibility'), array('DATASOURCE_TYPE', 'DATASOURCE_LANGUAGE', 'CONTENT', 'COMPATIBILITY'), array('NO_DATASOURCE_TYPE_STATISTICS_FOUND', 'NO_DATASOURCE_LANGUAGE_STATISTICS_FOUND', 'NO_CONTENT_STATISTICS_FOUND', 'NO_COMPATIBILITY_STATISTICS_FOUND'), array(self :: DATASOURCE_TYPE, self :: DATASOURCE_LANGUAGE, self :: DATASOURCE_CONTENT, self :: DATASOURCE_COMPATIBILITY));
			JLog :: add('Retrieved datasource statistics in ' . (microtime(TRUE) - $time) . ' s (locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $statistics;
		} catch (Exception $e) {
			JLog :: add('Error retrieving datasource statistics locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}

	// Perform a simple search for publications.
	// $keyword the keyword to search for
	// $articles flag to limit searching on articles; if all flags are FALSE no limits apply
	// $books flag to limit searching on books; if all flags are FALSE no limits apply
	// $theses flag to limit searching on books; if all flags are FALSE no limits apply
	// $reports flag to limit searching on reports; if all flags are FALSE no limits apply
	// $type the ID of the publication type to use as filter or NULL for no publication type filtering
	// $language the ID of the language to use as filter or NULL for no language filtering
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the funding stream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $year the year of publication to use as filter or NULL for no year filtering
	// $accessMode the ID of the access mode to use as filter or NULL for no access mode filtering
	// $datasource the ID of the datasource to use as filter or NULL for no datasource filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing publications and statistics
	private function _searchPublications($keyword, $articles, $books, $theses, $reports, $type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $community, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PUBLICATION_QUERY;
			$query .= ($keyword == NULL) ? '' : ' and "' . str_replace('"', '\\"', $keyword) . '"';
			$types = array();
			if ($articles) {
				$types[] = self :: PUBLICATION_ARTICLE;
				$types[] = self :: PUBLICATION_PREPRINT;
			}
			if ($books) {
				$types[] = self :: PUBLICATION_BOOK;
				$types[] = self :: PUBLICATION_BOOK_PART;
			}
			if ($theses) {
				$types[] = self :: PUBLICATION_PHD_THESIS;
				$types[] = self :: PUBLICATION_MASTER_THESIS;
				$types[] = self :: PUBLICATION_BACHELOR_THESIS;
			}
			if ($reports) {
				$types[] = self :: PUBLICATION_REPORT;
				$types[] = self :: PUBLICATION_INTERNAL_REPORT;
				$types[] = self :: PUBLICATION_EXTERNAL_REPORT;
			}
			$publicationType = self :: PUBLICATION_TYPE;
			$types = implode(' or ', array_map(function($type) use ($publicationType) {return '(' . $publicationType . ' exact "' . $type . '")';}, $types));
			$query .= ($types == NULL) ? '' : (' and (' . $types . ')');
			$query .= ($type == NULL) ? '' : (' and (' . self :: PUBLICATION_TYPE . ' exact "' . $type . '")');
			$query .= ($language == NULL) ? '' : (' and (' . self :: PUBLICATION_LANGUAGE . ' exact "' . $language . '")');
			$query .= ($funder == NULL) ? '' : (' and (' . self :: PUBLICATION_FUNDER . ' exact "' . $funder . '")');
			$query .= ($fundingStream == NULL) ? '' : (' and (' . self :: PUBLICATION_FUNDING_STREAM . ' exact "' . $fundingStream . '")');
			$query .= ($scientificArea == NULL) ? '' : (' and (' . self :: PUBLICATION_SCIENTIFIC_AREA . ' exact "' . $scientificArea . '")');
			$query .= ($year == NULL) ? '' : (' and (' . self :: PUBLICATION_YEAR . ' exact ' . $year . ')');
			$query .= ($accessMode == NULL) ? '' : (' and (' . self :: PUBLICATION_ACCESS_MODE . ' exact "' . $accessMode . '")');
			$query .= ($datasource == NULL) ? '' : (' and (' . self :: PUBLICATION_DATASOURCE . ' exact "' . $datasource . '")');
            $query .= ($community == NULL) ? '' : (' and (' . self :: PUBLICATION_CONTEXT . ' exact "' . $community . '")');
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
            if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=results_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: PUBLICATION_TYPE . '&fields=' . self :: PUBLICATION_LANGUAGE . '&fields=' . self :: PUBLICATION_FUNDER . '&fields=' . self :: PUBLICATION_FUNDING_STREAM . '&fields=' . self :: PUBLICATION_SCIENTIFIC_AREA . '&fields=' . self :: PUBLICATION_YEAR . '&fields=' . self :: PUBLICATION_ACCESS_MODE . '&fields=' . self :: PUBLICATION_DATASOURCE . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
            if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
            $document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalPublications = $this -> parseTotalResults($xpath);
			$result -> publications = $this -> parsePublications($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('type', 'languageFilter', 'funder', 'fundingStream', 'scientificArea', 'year', 'accessMode', 'datasource'), array('DOCUMENT_TYPE', 'DOCUMENT_LANGUAGE', 'FUNDER', 'FUNDING_STREAM', 'SCIENTIFIC_AREA', 'PUBLICATION_YEAR', 'ACCESS_MODE', 'DATASOURCE'), array('NO_DOCUMENT_TYPE_STATISTICS_FOUND', 'NO_DOCUMENT_LANGUAGE_STATISTICS_FOUND', 'NO_FUNDER_STATISTICS_FOUND', 'NO_FUNDING_STREAM_STATISTICS_FOUND', 'NO_SCIENTIFIC_AREA_STATISTICS_FOUND', 'NO_PUBLICATION_YEAR_STATISTICS_FOUND', 'NO_ACCESS_MODE_STATISTICS_FOUND', 'NO_DATASOURCE_STATISTICS_FOUND'), array(self :: PUBLICATION_TYPE, self :: PUBLICATION_LANGUAGE, self :: PUBLICATION_FUNDER, self :: PUBLICATION_FUNDING_STREAM, self :: PUBLICATION_SCIENTIFIC_AREA, self :: PUBLICATION_YEAR, self :: PUBLICATION_ACCESS_MODE, self :: PUBLICATION_DATASOURCE));
			JLog :: add('Simple search retrieved ' . count($result -> publications) . ' publications in ' . (microtime(TRUE) - $time) . ' s (keyword: ' . $keyword . ', articles: ' . ($articles ? 'true' : 'false') . ', books: ' . ($books ? 'true' : 'false') . ', theses: ' . ($theses ? 'true' : 'false') . ', reports: ' . ($reports ? 'true' : 'false') . ', type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', year: ' . (($year == NULL) ? 'null' : $year) . ', access mode: ' . (($accessMode == NULL) ? 'null' : $accessMode) . ', datasource: ' . (($datasource == NULL) ? 'null' : $datasource) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing publication simple search (keyword: ' . $keyword . ', articles: ' . ($articles ? 'true' : 'false') . ', books: ' . ($books ? 'true' : 'false') . ', theses: ' . ($theses ? 'true' : 'false') . ', reports: ' . ($reports ? 'true' : 'false') . ', type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', year: ' . (($year == NULL) ? 'null' : $year) . ', access mode: ' . (($accessMode == NULL) ? 'null' : $accessMode) . (($datasource == NULL) ? 'null' : $datasource) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform a simple search for datasets.
	// $keyword the keyword to search for
	// $type the ID of the dataset type to use as filter or NULL for no dataset type filtering
	// $language the ID of the language to use as filter or NULL for no language filtering
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the funding stream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $year the year of publication to use as filter or NULL for no year filtering
	// $accessMode the ID of the access mode to use as filter or NULL for no access mode filtering
	// $datasource the ID of the datasource to use as filter or NULL for no datasource filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing datasets and statistics
	private function _searchDatasets($keyword, $type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: DATASET_QUERY;
			$query .= ($keyword == NULL) ? '' : ' and "' . str_replace('"', '\\"', $keyword) . '"';
			$query .= ($type == NULL) ? '' : (' and (' . self :: DATASET_TYPE . ' exact "' . $type . '")');
			$query .= ($language == NULL) ? '' : (' and (' . self :: DATASET_LANGUAGE . ' exact "' . $language . '")');
			$query .= ($funder == NULL) ? '' : (' and (' . self :: DATASET_FUNDER . ' exact "' . $funder . '")');
			$query .= ($fundingStream == NULL) ? '' : (' and (' . self :: DATASET_FUNDING_STREAM . ' exact "' . $fundingStream . '")');
			$query .= ($scientificArea == NULL) ? '' : (' and (' . self :: DATASET_SCIENTIFIC_AREA . ' exact "' . $scientificArea . '")');
			$query .= ($year == NULL) ? '' : (' and (' . self :: DATASET_YEAR . ' exact ' . $year . ')');
			$query .= ($accessMode == NULL) ? '' : (' and (' . self :: DATASET_ACCESS_MODE . ' exact "' . $accessMode . '")');
			$query .= ($datasource == NULL) ? '' : (' and (' . self :: DATASET_DATASOURCE . ' exact "' . $datasource . '")');
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=results_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: DATASET_TYPE . '&fields=' . self :: DATASET_LANGUAGE . '&fields=' . self :: DATASET_FUNDER . '&fields=' . self :: DATASET_FUNDING_STREAM . '&fields=' . self :: DATASET_SCIENTIFIC_AREA . '&fields=' . self :: DATASET_YEAR . '&fields=' . self :: DATASET_ACCESS_MODE . '&fields=' . self :: DATASET_DATASOURCE . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalDatasets = $this -> parseTotalResults($xpath);
			$result -> datasets = $this -> parseDatasets($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('type', 'languageFilter', 'funder', 'fundingStream', 'scientificArea', 'year', 'accessMode', 'datasource'), array('DATASET_TYPE', 'DATASET_LANGUAGE', 'FUNDER', 'FUNDING_STREAM', 'SCIENTIFIC_AREA', 'PUBLICATION_YEAR', 'ACCESS_MODE', 'DATASOURCE'), array('NO_DATASET_TYPE_STATISTICS_FOUND', 'NO_DATASET_LANGUAGE_STATISTICS_FOUND', 'NO_FUNDER_STATISTICS_FOUND', 'NO_FUNDING_STREAM_STATISTICS_FOUND', 'NO_SCIENTIFIC_AREA_STATISTICS_FOUND', 'NO_PUBLICATION_YEAR_STATISTICS_FOUND', 'NO_ACCESS_MODE_STATISTICS_FOUND', 'NO_DATASOURCE_STATISTICS_FOUND'), array(self :: DATASET_TYPE, self :: DATASET_LANGUAGE, self :: DATASET_FUNDER, self :: DATASET_FUNDING_STREAM, self :: DATASET_SCIENTIFIC_AREA, self :: DATASET_YEAR, self :: DATASET_ACCESS_MODE, self :: DATASET_DATASOURCE));
			JLog :: add('Simple search retrieved ' . count($result -> datasets) . ' datasets in ' . (microtime(TRUE) - $time) . ' s (keyword: ' . $keyword . ', type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', year: ' . (($year == NULL) ? 'null' : $year) . ', access mode: ' . (($accessMode == NULL) ? 'null' : $accessMode) . ', datasource: ' . (($datasource == NULL) ? 'null' : $datasource) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing dataset simple search (keyword: ' . $keyword . ', type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', year: ' . (($year == NULL) ? 'null' : $year) . ', access mode: ' . (($accessMode == NULL) ? 'null' : $accessMode) . (($datasource == NULL) ? 'null' : $datasource) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform a simple search for projects.
	// $keyword the keyword to search for
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the funding stream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $startYear the start year to use as filter or NULL for no start year filtering
	// $endYear the end year to suse as filter or NULL for no end year filtering
	// $sc39 the SC-39 status to use as filter or NULL for no SC-39 status filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing projects and statistics
	private function _searchProjects($keyword, $funder, $fundingStream, $scientificArea, $startYear, $endYear, $sc39, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PROJECT_QUERY;
			$query .= ($keyword == NULL) ? '' : ' and ((' . self :: PROJECT_ACRONYM . ' = "' . str_replace('"', '\\"', $keyword) . '") or (' . self :: PROJECT_CODE . ' = "' . str_replace('"', '\\"', $keyword) . '") or (' . self :: PROJECT_TITLE . ' = "' . str_replace('"', '\\"', $keyword) . '"))';
			$query .= ($funder == NULL) ? '' : (' and (' . self :: PROJECT_FUNDER . ' exact "' . $funder . '")');
			$query .= ($fundingStream == NULL) ? '' : (' and (' . self :: PROJECT_FUNDING_STREAM . ' exact "' . $fundingStream . '")');
			$query .= ($scientificArea == NULL) ? '' : (' and (' . self :: PROJECT_SCIENTIFIC_AREA . ' exact "' . $scientificArea . '")');
			$query .= ($startYear == NULL) ? '' : (' and (' . self :: PROJECT_START_YEAR . ' exact ' . $startYear . ')');
			$query .= ($endYear == NULL) ? '' : (' and (' . self :: PROJECT_END_YEAR . ' exact ' . $endYear . ')');
			$query .= ($sc39 === NULL) ? '' : (' and (' . self :: PROJECT_SC39 . ' exact ' . ($sc39 ? 'true' : 'false') . ')');
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=projects_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: PROJECT_FUNDER . '&fields=' . self :: PROJECT_FUNDING_STREAM . '&fields=' . self :: PROJECT_SCIENTIFIC_AREA . '&fields=' . self :: PROJECT_START_YEAR . '&fields=' . self :: PROJECT_END_YEAR . '&fields=' . self :: PROJECT_SC39 . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalProjects = $this -> parseTotalResults($xpath);
			$result -> projects = $this -> parseProjects($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('funder', 'fundingStream', 'scientificArea', 'startYear', 'endYear', 'sc39'), array('FUNDER', 'FUNDING_STREAM', 'SCIENTIFIC_AREA', 'START_YEAR', 'END_YEAR', 'SPECIAL_CLAUSE_39'), array('NO_FUNDER_STATISTICS_FOUND', 'NO_FUNDING_STREAM_STATISTICS_FOUND', 'NO_SCIENTIFIC_AREA_STATISTICS_FOUND', 'NO_START_YEAR_STATISTICS_FOUND', 'NO_END_YEAR_STATISTICS_FOUND', 'NO_SPECIAL_CLAUSE_39_STATISTICS_FOUND'), array(self :: PROJECT_FUNDER, self :: PROJECT_FUNDING_STREAM, self :: PROJECT_SCIENTIFIC_AREA, self :: PROJECT_START_YEAR, self :: PROJECT_END_YEAR, self :: PROJECT_SC39));
			JLog :: add('Simple search retrieved ' . count($result -> projects) . ' projects in ' . (microtime(TRUE) - $time) . ' s (keyword: ' . $keyword . ', funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', start year: ' . (($startYear == NULL) ? 'null' : $startYear) . ', end year: ' . (($endYear == NULL) ? 'null' : $endYear) . ', SC-39: ' . (($sc39 === NULL) ? 'null' : ($sc39 ? 'true' : 'false')) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing project simple search (keyword: ' . $keyword . ', funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', start year: ' . (($startYear == NULL) ? 'null' : $startYear) . ', end year: ' . (($endYear == NULL) ? 'null' : $endYear) . ', SC-39: ' . (($sc39 === NULL) ? 'null' : ($sc39 ? 'true' : 'false')) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}			
	// Perform a simple search for people.
	// $keyword the keyword to search for
	// $country the country to use as filter or NULL for no country filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing people and statistics
	private function _searchPeople($keyword, $country, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PERSON_QUERY;
			$query .= ($keyword == NULL) ? '' : ' and "' . str_replace('"', '\\"', $keyword) . '"';
			$query .= ($country == NULL) ? '' : (' and ('. self :: PERSON_COUNTRY . ' exact "' . $country . '")');
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=persons_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: PERSON_COUNTRY . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalPeople = $this -> parseTotalResults($xpath);
			$result -> people = $this -> parsePeople($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('country'), array('COUNTRY'), array('NO_COUNTRY_STATISTICS_FOUND'), array(self :: PERSON_COUNTRY));
			JLog :: add('Simple search retrieved ' . count($result -> people) . ' people in ' . (microtime(TRUE) - $time) . ' s (keyword: ' . $keyword . ', country: ' . (($country == NULL) ? 'null' : $country) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing people simple search (keyword: ' . $keyword . ', country: ' . (($country == NULL) ? 'null' : $country) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform a simple search for organizations.
	// $keyword the keyword to search for
	// $country the ID of the country to use as filter or NULL for no country filtering
	// $type the ID of the organization type to use as filter or NULL for no organization type filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing people and statistics
	private function _searchOrganizations($keyword, $country, $type, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: ORGANIZATION_QUERY;
			$query .= ($keyword == NULL) ? '' : (' and "' . str_replace('"', '\\"', $keyword) . '"');
			$query .= ($country == NULL) ? '' : (' and ('. self :: ORGANIZATION_COUNTRY . ' exact "' . $country . '")');
			switch ($type) {
			case 'legalBody':
				$query .= ' and (' . self :: ORGANIZATION_LEGAL_BODY . ' exact true)';
				break;
			case 'legalPerson':
				$query .= ' and (' . self :: ORGANIZATION_LEGAL_PERSON . ' exact true)';
				break;
			case 'nonProfit':
				$query .= ' and (' . self :: ORGANIZATION_NON_PROFIT . ' exact true)';
				break;
			case 'research':
				$query .= ' and (' . self :: ORGANIZATION_RESEARCH . ' exact true)';
				break;
			case 'euInterests':
				$query .= ' and (' . self :: ORGANIZATION_EU_INTERESTS . ' exact true)';
				break;
			case 'international':
				$query .= ' and (' . self :: ORGANIZATION_INTERNATIONAL . ' exact true)';
				break;
			case 'enterprise':
				$query .= ' and (' . self :: ORGANIZATION_ENTERPRISE . ' exact true)';
				break;
			case 'smallMediumEnterprise':
				$query .= ' and (' . self :: ORGANIZATION_SMALL_MEDIUM_ENTERPRISE . ' exact true)';
			}
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=organizations_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: ORGANIZATION_COUNTRY . '&fields=' . self :: ORGANIZATION_LEGAL_BODY . '&fields=' . self :: ORGANIZATION_LEGAL_PERSON . '&fields=' . self :: ORGANIZATION_NON_PROFIT . '&fields=' . self :: ORGANIZATION_RESEARCH . '&fields=' . self :: ORGANIZATION_EU_INTERESTS . '&fields=' . self :: ORGANIZATION_INTERNATIONAL . '&fields=' . self :: ORGANIZATION_ENTERPRISE . '&fields=' . self :: ORGANIZATION_SMALL_MEDIUM_ENTERPRISE . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalOrganizations = $this -> parseTotalResults($xpath);
			$result -> organizations = $this -> parseOrganizations($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('country'), array('COUNTRY'), array('NO_COUNTRY_STATISTICS_FOUND'), array(self :: ORGANIZATION_COUNTRY));
			$result -> statistics['type'] = new JObject();
			$result -> statistics['type'] -> id = 'type';
			$result -> statistics['type'] -> title = JText :: _('ORGANIZATION_TYPE');
			$result -> statistics['type'] -> error = JText :: _('NO_ORGANIZATION_TYPE_STATISTICS_FOUND');
			$result -> statistics['type'] -> data = array();
			$legalBody = $this -> parseStatistics($xpath, self :: ORGANIZATION_LEGAL_BODY);
			if (($legalBody != NULL) && array_key_exists('true', $legalBody)) {
				$result -> statistics['type'] -> data['legalBody'] = new JObject();
				$result -> statistics['type'] -> data['legalBody'] -> id = 'legalBody';
				$result -> statistics['type'] -> data['legalBody'] -> name = JText :: _('LEGAL_BODY');
				$result -> statistics['type'] -> data['legalBody'] -> count = $legalBody['true'] -> count;
			}
			$legalPerson = $this -> parseStatistics($xpath, self :: ORGANIZATION_LEGAL_PERSON);
			if (($legalPerson != NULL) && array_key_exists('true', $legalPerson)) {
				$result -> statistics['type'] -> data['legalPerson'] = new JObject();
				$result -> statistics['type'] -> data['legalPerson'] -> id = 'legalPerson';
				$result -> statistics['type'] -> data['legalPerson'] -> name = JText :: _('LEGAL_PERSON');
				$result -> statistics['type'] -> data['legalPerson'] -> count = $legalPerson['true'] -> count;
			}
			$nonProfit = $this -> parseStatistics($xpath, self :: ORGANIZATION_NON_PROFIT);
			if (($nonProfit != NULL) && array_key_exists('true', $nonProfit)) {
				$result -> statistics['type'] -> data['nonProfit'] = new JObject();
				$result -> statistics['type'] -> data['nonProfit'] -> id = 'nonProfit';
				$result -> statistics['type'] -> data['nonProfit'] -> name = JText :: _('NON_PROFIT_ORGANIZATION');
				$result -> statistics['type'] -> data['nonProfit'] -> count = $nonProfit['true'] -> count;
			}
			$research = $this -> parseStatistics($xpath, self :: ORGANIZATION_RESEARCH);
			if (($research != NULL) && array_key_exists('true', $research)) {
				$result -> statistics['type'] -> data['research'] = new JObject();
				$result -> statistics['type'] -> data['research'] -> id = 'research';
				$result -> statistics['type'] -> data['research'] -> name = JText :: _('RESEARCH_ORGANIZATION');
				$result -> statistics['type'] -> data['research'] -> count = $research['true'] -> count;
			}			
			$euInterests = $this -> parseStatistics($xpath, self :: ORGANIZATION_EU_INTERESTS);
			if (($euInterests != NULL) && array_key_exists('true', $euInterests)) {
				$result -> statistics['type'] -> data['euInterests'] = new JObject();
				$result -> statistics['type'] -> data['euInterests'] -> id = 'euInterests';
				$result -> statistics['type'] -> data['euInterests'] -> name = JText :: _('EU_INTERESTS_ORGANIZATION');
				$result -> statistics['type'] -> data['euInterests'] -> count = $euInterests['true'] -> count;
			}
			$international = $this -> parseStatistics($xpath, self :: ORGANIZATION_INTERNATIONAL);
			if (($international != NULL) && array_key_exists('true', $international)) {
				$result -> statistics['type'] -> data['international'] = new JObject();
				$result -> statistics['type'] -> data['international'] -> id = 'international';
				$result -> statistics['type'] -> data['international'] -> name = JText :: _('INTERNATIONAL_ORGANIZATION');
				$result -> statistics['type'] -> data['international'] -> count = $international['true'] -> count;
			}
			$enterprise = $this -> parseStatistics($xpath, self :: ORGANIZATION_ENTERPRISE);
			if (($enterprise != NULL) && array_key_exists('true', $enterprise)) {
				$result -> statistics['type'] -> data['enterprise'] = new JObject();
				$result -> statistics['type'] -> data['enterprise'] -> id = 'enterprise';
				$result -> statistics['type'] -> data['enterprise'] -> name = JText :: _('ENTERPRISE');
				$result -> statistics['type'] -> data['enterprise'] -> count = $enterprise['true'] -> count;
			}
			$smallMediumEnterprise = $this -> parseStatistics($xpath, self :: ORGANIZATION_SMALL_MEDIUM_ENTERPRISE);
			if (($smallMediumEnterprise != NULL) && array_key_exists('true', $smallMediumEnterprise)) {
				$result -> statistics['type'] -> data['smallMediumEnterprise'] = new JObject();
				$result -> statistics['type'] -> data['smallMediumEnterprise'] -> id = 'smallMediumEnterprise';
				$result -> statistics['type'] -> data['smallMediumEnterprise'] -> name = JText :: _('SMALL_MEDIUM_ENTERPRISE');
				$result -> statistics['type'] -> data['smallMediumEnterprise'] -> count = $smallMediumEnterprise['true'] -> count;
			}
			uasort($result -> statistics['type'] -> data, function ($row1, $row2) {return $row2 -> count - $row1 -> count;});
			JLog :: add('Simple search retrieved ' . count($result -> organizations) . ' organizations in ' . (microtime(TRUE) - $time) . ' s (keyword: ' . $keyword . ', country: ' . (($country == NULL) ? 'null' : $country) . ', type: ' . (($type == NULL) ? 'null' : $type) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing organization simple search (keyword: ' . $keyword . ', country: ' . (($country == NULL) ? 'null' : $country) . ', type: ' . (($type == NULL) ? 'null' : $type) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform a simple search for datasources.
	// $keyword the keyword to search for
	// $type the ID of the datasource type to use as filter or NULL for no datasource type filtering
	// $language the ID of the datasource language to use as filter or NULL for no datasource language filtering
	// $content the ID of the content to use as filter or NULL for no project filtering
	// $compatibility the ID of the compatibility level to use as filter or NULL for no compatibility level filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing datasources and statistics
	private function _searchDatasources($keyword, $type, $language, $content, $compatibility, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: DATASOURCE_QUERY;
			$query .= ($keyword == NULL) ? '' : (' and "' . str_replace('"', '\\"', $keyword) . '"');
			$query .= ($type == NULL) ? '' : (' and ('. self :: DATASOURCE_TYPE . ' exact "' . $type . '")');
			$query .= ($language == NULL) ? '' : (' and ('. self :: DATASOURCE_LANGUAGE . ' exact "' . $language . '")');
			$query .= ($content == NULL) ? '' : (' and ('. self :: DATASOURCE_CONTENT . ' exact "' . $content . '")');
			$query .= ($compatibility == NULL) ? '' : (' and ('. self :: DATASOURCE_COMPATIBILITY . ' exact "' . $compatibility . '")');			
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=datasources_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: DATASOURCE_TYPE . '&fields=' . self :: DATASOURCE_LANGUAGE . '&fields=' . self :: DATASOURCE_CONTENT . '&fields=' . self :: DATASOURCE_COMPATIBILITY . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalDatasources = $this -> parseTotalResults($xpath);
			$result -> datasources = $this -> parseDatasources($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('type', 'language', 'content', 'compatibility'), array('DATASOURCE_TYPE', 'DATASOURCE_LANGUAGE', 'CONTENT', 'COMPATIBILITY'), array('NO_DATASOURCE_TYPE_STATISTICS_FOUND', 'NO_DATASOURCE_LANGUAGE_STATISTICS_FOUND', 'NO_CONTENT_STATISTICS_FOUND', 'NO_COMPATIBILITY_STATISTICS_FOUND'), array(self :: DATASOURCE_TYPE, self :: DATASOURCE_LANGUAGE, self :: DATASOURCE_CONTENT, self :: DATASOURCE_COMPATIBILITY));
			JLog :: add('Simple search retrieved ' . count($result -> datasources) . ' datasources in ' . (microtime(TRUE) - $time) . ' s (keyword: ' . $keyword . ', type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', content: ' . (($content == NULL) ? 'null' : $content) . ', compatibility: ' . (($compatibility == NULL) ? 'null' : $compatibility) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing datasource simple search (keyword: ' . $keyword . ', type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', content: ' . (($content == NULL) ? 'null' : $content) . ', compatibility: ' . (($compatibility == NULL) ? 'null' : $compatibility) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform a browse for publications.
	// $type the ID of the publication type to use as filter or NULL for no publication type filtering
	// $language the ID of the language to use as filter or NULL for no language filtering
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the fundingStream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $year the year of publication to use as filter or NULL for no year filtering
	// $accessMode the ID of the access mode to use as filter or NULL for no access mode filtering
	// $datasource the ID of the datasource to use as filter or NULL for no datasource filtering
	// $community the ID of the community to use as filter or NULL for no datasource filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// $project the ID of the project to use as filter or NULL for no project filtering
	// $author the ID of the author to use as filter or NULL for no author filtering
	// return a result (object) containing publications and statistics
	 private function _browsePublications($type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $community, $page, $size, $locale, $project, $author) {
		try {
			$time = microtime(TRUE);
			$query = self :: PUBLICATION_QUERY;
			$query .= ($type == NULL) ? '' : (' and (' . self :: PUBLICATION_TYPE . ' exact "' . $type . '")');
			$query .= ($language == NULL) ? '' : (' and (' . self :: PUBLICATION_LANGUAGE . ' exact "' . $language . '")');
			$query .= ($funder == NULL) ? '' : (' and (' . self :: PUBLICATION_FUNDER . ' exact "' . $funder . '")');
			$query .= ($fundingStream == NULL) ? '' : (' and (' . self :: PUBLICATION_FUNDING_STREAM . ' exact "' . $fundingStream . '")');
			$query .= ($scientificArea == NULL) ? '' : (' and (' . self :: PUBLICATION_SCIENTIFIC_AREA . ' exact "' . $scientificArea . '")');
			$query .= ($year == NULL) ? '' : (' and (' . self :: PUBLICATION_YEAR . ' exact ' . $year . ')');
			$query .= ($accessMode == NULL) ? '' : (' and (' . self :: PUBLICATION_ACCESS_MODE . ' exact "' . $accessMode . '")');
			$query .= ($datasource == NULL) ? '' : (' and (' . self :: PUBLICATION_DATASOURCE . ' exact "' . $datasource . '")');
			$query .= ($project == NULL) ? '' : (' and (' . self :: PUBLICATION_PROJECT . ' exact "' . $project . '")');
			$query .= ($author == NULL) ? '' : (' and (' . self :: PUBLICATION_AUTHOR_ID . ' exact "' . $author . '")');
			$query .= ($community == NULL) ? '' : (' and (' . self :: PUBLICATION_CONTEXT . ' exact "' . $community . '")');
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=results_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: PUBLICATION_TYPE . '&fields=' . self :: PUBLICATION_LANGUAGE . '&fields=' . self :: PUBLICATION_FUNDER . '&fields=' . self :: PUBLICATION_FUNDING_STREAM . '&fields=' . self :: PUBLICATION_SCIENTIFIC_AREA . '&fields=' . self :: PUBLICATION_YEAR . '&fields=' . self :: PUBLICATION_ACCESS_MODE . '&fields=' . self :: PUBLICATION_DATASOURCE . '&fields=' . self :: PUBLICATION_CONTEXT . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalPublications = $this -> parseTotalResults($xpath);
			$result -> publications = $this -> parsePublications($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('type', 'languageFilter', 'funder', 'fundingStream', 'scientificArea', 'year', 'accessMode', 'datasource', 'community'), array('DOCUMENT_TYPE', 'DOCUMENT_LANGUAGE', 'FUNDER', 'FUNDING_STREAM', 'SCIENTIFIC_AREA', 'PUBLICATION_YEAR', 'ACCESS_MODE', 'DATASOURCE', 'COMMUNITY'), array('NO_DOCUMENT_TYPE_STATISTICS_FOUND', 'NO_DOCUMENT_LANGUAGE_STATISTICS_FOUND', 'NO_FUNDER_STATISTICS_FOUND', 'NO_FUNDING_STREAM_STATISTICS_FOUND', 'NO_SCIENTIFIC_AREA_STATISTICS_FOUND', 'NO_YEAR_STATISTICS_FOUND', 'NO_ACCESS_MODE_STATISTICS_FOUND', 'NO_CONTEXT_STATISTICS_FOUND', 'NO_DATASOURCE_STATISTICS_FOUND'), array(self :: PUBLICATION_TYPE, self :: PUBLICATION_LANGUAGE, self :: PUBLICATION_FUNDER, self :: PUBLICATION_FUNDING_STREAM, self :: PUBLICATION_SCIENTIFIC_AREA, self :: PUBLICATION_YEAR, self :: PUBLICATION_ACCESS_MODE, self :: PUBLICATION_DATASOURCE, self :: PUBLICATION_CONTEXT));
			JLog :: add('Browse retrieved ' . count($result -> publications) . ' publications in ' . (microtime(TRUE) - $time) . ' s (type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', year: ' . (($year == NULL) ? 'null' : $year) . ', access mode: ' . (($accessMode == NULL) ? 'null' : $accessMode) . ', datasource: ' . (($datasource == NULL) ? 'null' : $datasource) . ', community: ' . (($community == NULL) ? 'null' : $community) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ', project: ' . (($project == NULL) ? 'null' : $project) . ', author: ' . (($author == NULL) ? 'null' : $author) . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing publication browse (type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', year: ' . (($year == NULL) ? 'null' : $year) . ', access mode: ' . (($accessMode == NULL) ? 'null' : $accessMode) . ', datasource: ' . (($datasource == NULL) ? 'null' : $datasource) . ', community: ' . (($community == NULL) ? 'null' : $community) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ', project: ' . (($project == NULL) ? 'null' : $project) . ', author: ' . (($author == NULL) ? 'null' : $author) . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform a browse for datasets.
	// $type the ID of the dataset type to use as filter or NULL for no dataset type filtering
	// $language the ID of the language to use as filter or NULL for no language filtering
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the fundingStream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $year the year of publication to use as filter or NULL for no year filtering
	// $accessMode the ID of the access mode to use as filter or NULL for no access mode filtering
	// $datasource the ID of the datasource to use as filter or NULL for no datasource filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// $project the ID of the project to use as filter or NULL for no project filtering
	// $author the ID of the author to use as filter or NULL for no author filtering
	// return a result (object) containing datasets and statistics
	 private function _browseDatasets($type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $page, $size, $locale, $project, $author) {
		try {
			$time = microtime(TRUE);
			$query = self :: DATASET_QUERY;
			$query .= ($type == NULL) ? '' : (' and (' . self :: DATASET_TYPE . ' exact "' . $type . '")');
			$query .= ($language == NULL) ? '' : (' and (' . self :: DATASET_LANGUAGE . ' exact "' . $language . '")');
			$query .= ($funder == NULL) ? '' : (' and (' . self :: DATASET_FUNDER . ' exact "' . $funder . '")');
			$query .= ($fundingStream == NULL) ? '' : (' and (' . self :: DATASET_FUNDING_STREAM . ' exact "' . $fundingStream . '")');
			$query .= ($scientificArea == NULL) ? '' : (' and (' . self :: DATASET_SCIENTIFIC_AREA . ' exact "' . $scientificArea . '")');
			$query .= ($year == NULL) ? '' : (' and (' . self :: DATASET_YEAR . ' exact ' . $year . ')');
			$query .= ($accessMode == NULL) ? '' : (' and (' . self :: DATASET_ACCESS_MODE . ' exact "' . $accessMode . '")');
			$query .= ($datasource == NULL) ? '' : (' and (' . self :: DATASET_DATASOURCE . ' exact "' . $datasource . '")');
			$query .= ($project == NULL) ? '' : (' and (' . self :: DATASET_PROJECT . ' exact "' . $project . '")');
			$query .= ($author == NULL) ? '' : (' and (' . self :: DATASET_AUTHOR_ID . ' exact "' . $author . '")');
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=results_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: DATASET_TYPE . '&fields=' . self :: DATASET_LANGUAGE . '&fields=' . self :: DATASET_FUNDER . '&fields=' . self :: DATASET_FUNDING_STREAM . '&fields=' . self :: DATASET_SCIENTIFIC_AREA . '&fields=' . self :: DATASET_YEAR . '&fields=' . self :: DATASET_ACCESS_MODE . '&fields=' . self :: DATASET_DATASOURCE . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalDatasets = $this -> parseTotalResults($xpath);
			$result -> datasets = $this -> parseDatasets($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('type', 'languageFilter', 'funder', 'fundingStream', 'scientificArea', 'year', 'accessMode', 'datasource'), array('DATASET_TYPE', 'DATASET_LANGUAGE', 'FUNDER', 'FUNDING_STREAM', 'SCIENTIFIC_AREA', 'PUBLICATION_YEAR', 'ACCESS_MODE', 'DATASOURCE'), array('NO_DATASET_TYPE_STATISTICS_FOUND', 'NO_DATASET_LANGUAGE_STATISTICS_FOUND', 'NO_FUNDER_STATISTICS_FOUND', 'NO_FUNDING_STREAM_STATISTICS_FOUND', 'NO_SCIENTIFIC_AREA_STATISTICS_FOUND', 'NO_YEAR_STATISTICS_FOUND', 'NO_ACCESS_MODE_STATISTICS_FOUND', 'NO_DATASOURCE_STATISTICS_FOUND'), array(self :: DATASET_TYPE, self :: DATASET_LANGUAGE, self :: DATASET_FUNDER, self :: DATASET_FUNDING_STREAM, self :: DATASET_SCIENTIFIC_AREA, self :: DATASET_YEAR, self :: DATASET_ACCESS_MODE, self :: DATASET_DATASOURCE));
			JLog :: add('Browse retrieved ' . count($result -> datasets) . ' datasets in ' . (microtime(TRUE) - $time) . ' s (type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', year: ' . (($year == NULL) ? 'null' : $year) . ', access mode: ' . (($accessMode == NULL) ? 'null' : $accessMode) . ', datasource: ' . (($datasource == NULL) ? 'null' : $datasource) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ', project: ' . (($project == NULL) ? 'null' : $project) . ', author: ' . (($author == NULL) ? 'null' : $author) . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing dataset browse (type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', year: ' . (($year == NULL) ? 'null' : $year) . ', access mode: ' . (($accessMode == NULL) ? 'null' : $accessMode) . ', datasource: ' . (($datasource == NULL) ? 'null' : $datasource) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ', project: ' . (($project == NULL) ? 'null' : $project) . ', author: ' . (($author == NULL) ? 'null' : $author) . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform a browse for projects.
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the fundingStream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $startYear the start year to use as filter or NULL for no start year filtering
	// $endYear the end year to use as filter or NULL for no end year filtering
	// $$sc39 the SC-39 status to use as filter or NULL for no SC-39 status filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing projects and statistics
	private function _browseProjects($funder, $fundingStream, $scientificArea, $startYear, $endYear, $sc39, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PROJECT_QUERY;
			$query .= ($funder == NULL) ? '' : (' and (' . self :: PROJECT_FUNDER . ' exact "' . $funder . '")');
			$query .= ($fundingStream == NULL) ? '' : (' and (' . self :: PROJECT_FUNDING_STREAM . ' exact "' . $fundingStream . '")');
			$query .= ($scientificArea == NULL) ? '' : (' and (' . self :: PROJECT_SCIENTIFIC_AREA . ' exact "' . $scientificArea . '")');
			$query .= ($startYear == NULL) ? '' : (' and (' . self :: PROJECT_START_YEAR . ' exact ' . $startYear . ')');
			$query .= ($endYear == NULL) ? '' : (' and (' . self :: PROJECT_END_YEAR . ' exact ' . $endYear . ')');
			$query .= ($sc39 === NULL) ? '' : (' and (' . self :: PROJECT_SC39 . ' exact ' . ($sc39 ? 'true' : 'false') . ')');
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=projects_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: PROJECT_FUNDER . '&fields=' . self :: PROJECT_FUNDING_STREAM . '&fields=' . self :: PROJECT_SCIENTIFIC_AREA . '&fields=' . self :: PROJECT_START_YEAR . '&fields=' . self :: PROJECT_END_YEAR . '&fields=' . self :: PROJECT_SC39 . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalProjects = $this -> parseTotalResults($xpath);
			$result -> projects = $this -> parseProjects($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('funder', 'fundingStream', 'scientificArea', 'startYear', 'endYear', 'sc39'), array('FUNDER', 'FUNDING_STREAM', 'SCIENTIFIC_AREA', 'START_YEAR', 'END_YEAR', 'SPECIAL_CLAUSE_39'), array('NO_FUNDER_STATISTICS_FOUND', 'NO_FUNDING_STREAM_STATISTICS_FOUND', 'NO_SCIENTIFIC_AREA_STATISTICS_FOUND', 'NO_START_YEAR_STATISTICS_FOUND', 'NO_END_YEAR_STATISTICS_FOUND', 'NO_SPECIAL_CLAUSE_39_STATISTICS_FOUND'), array(self :: PROJECT_FUNDER, self :: PROJECT_FUNDING_STREAM, self :: PROJECT_SCIENTIFIC_AREA, self :: PROJECT_START_YEAR, self :: PROJECT_END_YEAR, self :: PROJECT_SC39));
			JLog :: add('Browse retrieved ' . count($result -> projects) . ' projects in ' . (microtime(TRUE) - $time) . ' s (funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', start year: ' . (($startYear == NULL) ? 'null' : $startYear) . ', end year: ' . (($endYear == NULL) ? 'null' : $endYear) . ', SC-39: ' . (($sc39 === NULL) ? 'null' : ($sc39 ? 'true' : 'false')) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing project browse (funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', start year: ' . (($startYear == NULL) ? 'null' : $startYear) . ', end year: ' . (($endYear == NULL) ? 'null' : $endYear) . ', SC-39: ' . (($sc39 === NULL) ? 'null' : ($sc39 ? 'true' : 'false')) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform a browse for people.
	// $country the ID of the country to use as filter or NULL for no country filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing people and statistics
	private function _browsePeople($country, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PERSON_QUERY;
			$query .= ($country == NULL) ? '' : (' and ('. self :: PERSON_COUNTRY . ' exact "' . $country . '")');
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=persons_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: PERSON_COUNTRY . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalPeople = $this -> parseTotalResults($xpath);
			$result -> people = $this -> parsePeople($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('country'), array('COUNTRY'), array('NO_COUNTRY_STATISTICS_FOUND'), array(self :: PERSON_COUNTRY));
			JLog :: add('Browse retrieved ' . count($result -> people) . ' people in ' . (microtime(TRUE) - $time) . ' s (country: ' . (($country == NULL) ? 'null' : $country) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing people browse (country: ' . (($country == NULL) ? 'null' : $country) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform a browse for organizations.
	// $country the ID of the country to use as filter or NULL for no country filtering
	// $type the ID of the organization type to use as filter or NULL for no organization type filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing organizations and statistics
	private function _browseOrganizations($country, $type, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: ORGANIZATION_QUERY;
			$query .= ($country == NULL) ? '' : (' and ('. self :: ORGANIZATION_COUNTRY . ' exact "' . $country . '")');
			switch ($type) {
			case 'legalBody':
				$query .= ' and (' . self :: ORGANIZATION_LEGAL_BODY . ' exact true)';
				break;
			case 'legalPerson':
				$query .= ' and (' . self :: ORGANIZATION_LEGAL_PERSON . ' exact true)';
				break;
			case 'nonProfit':
				$query .= ' and (' . self :: ORGANIZATION_NON_PROFIT . ' exact true)';
				break;
			case 'research':
				$query .= ' and (' . self :: ORGANIZATION_RESEARCH . ' exact true)';
				break;
			case 'euInterests':
				$query .= ' and (' . self :: ORGANIZATION_EU_INTERESTS . ' exact true)';
				break;
			case 'international':
				$query .= ' and (' . self :: ORGANIZATION_INTERNATIONAL . ' exact true)';
				break;
			case 'enterprise':
				$query .= ' and (' . self :: ORGANIZATION_ENTERPRISE . ' exact true)';
				break;
			case 'smallMediumEnterprise':
				$query .= ' and (' . self :: ORGANIZATION_SMALL_MEDIUM_ENTERPRISE . ' exact true)';
			}
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=organizations_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: ORGANIZATION_COUNTRY . '&fields=' . self :: ORGANIZATION_LEGAL_BODY . '&fields=' . self :: ORGANIZATION_LEGAL_PERSON . '&fields=' . self :: ORGANIZATION_NON_PROFIT . '&fields=' . self :: ORGANIZATION_RESEARCH . '&fields=' . self :: ORGANIZATION_EU_INTERESTS . '&fields=' . self :: ORGANIZATION_INTERNATIONAL . '&fields=' . self :: ORGANIZATION_ENTERPRISE . '&fields=' . self :: ORGANIZATION_SMALL_MEDIUM_ENTERPRISE . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalOrganizations = $this -> parseTotalResults($xpath);
			$result -> organizations = $this -> parseOrganizations($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('country'), array('COUNTRY'), array('NO_COUNTRY_STATISTICS_FOUND'), array(self :: ORGANIZATION_COUNTRY));
			$result -> statistics['type'] = new JObject();
			$result -> statistics['type'] -> id = 'type';
			$result -> statistics['type'] -> title = JText :: _('ORGANIZATION_TYPE');
			$result -> statistics['type'] -> error = JText :: _('NO_ORGANIZATION_TYPE_STATISTICS_FOUND');
			$result -> statistics['type'] -> data = array();
			$legalBody = $this -> parseStatistics($xpath, self :: ORGANIZATION_LEGAL_BODY);
			if (($legalBody != NULL) && array_key_exists('true', $legalBody)) {
				$result -> statistics['type'] -> data['legalBody'] = new JObject();
				$result -> statistics['type'] -> data['legalBody'] -> id = 'legalBody';
				$result -> statistics['type'] -> data['legalBody'] -> name = JText :: _('LEGAL_BODY');
				$result -> statistics['type'] -> data['legalBody'] -> count = $legalBody['true'] -> count;
			}
			$legalPerson = $this -> parseStatistics($xpath, self :: ORGANIZATION_LEGAL_PERSON);
			if (($legalPerson != NULL) && array_key_exists('true', $legalPerson)) {
				$result -> statistics['type'] -> data['legalPerson'] = new JObject();
				$result -> statistics['type'] -> data['legalPerson'] -> id = 'legalPerson';
				$result -> statistics['type'] -> data['legalPerson'] -> name = JText :: _('LEGAL_PERSON');
				$result -> statistics['type'] -> data['legalPerson'] -> count = $legalPerson['true'] -> count;
			}
			$nonProfit = $this -> parseStatistics($xpath, self :: ORGANIZATION_NON_PROFIT);
			if (($nonProfit != NULL) && array_key_exists('true', $nonProfit)) {
				$result -> statistics['type'] -> data['nonProfit'] = new JObject();
				$result -> statistics['type'] -> data['nonProfit'] -> id = 'nonProfit';
				$result -> statistics['type'] -> data['nonProfit'] -> name = JText :: _('NON_PROFIT_ORGANIZATION');
				$result -> statistics['type'] -> data['nonProfit'] -> count = $nonProfit['true'] -> count;
			}
			$research = $this -> parseStatistics($xpath, self :: ORGANIZATION_RESEARCH);
			if (($research != NULL) && array_key_exists('true', $research)) {
				$result -> statistics['type'] -> data['research'] = new JObject();
				$result -> statistics['type'] -> data['research'] -> id = 'research';
				$result -> statistics['type'] -> data['research'] -> name = JText :: _('RESEARCH_ORGANIZATION');
				$result -> statistics['type'] -> data['research'] -> count = $research['true'] -> count;
			}			
			$euInterests = $this -> parseStatistics($xpath, self :: ORGANIZATION_EU_INTERESTS);
			if (($euInterests != NULL) && array_key_exists('true', $euInterests)) {
				$result -> statistics['type'] -> data['euInterests'] = new JObject();
				$result -> statistics['type'] -> data['euInterests'] -> id = 'euInterests';
				$result -> statistics['type'] -> data['euInterests'] -> name = JText :: _('EU_INTERESTS_ORGANIZATION');
				$result -> statistics['type'] -> data['euInterests'] -> count = $euInterests['true'] -> count;
			}
			$international = $this -> parseStatistics($xpath, self :: ORGANIZATION_INTERNATIONAL);
			if (($international != NULL) && array_key_exists('true', $international)) {
				$result -> statistics['type'] -> data['international'] = new JObject();
				$result -> statistics['type'] -> data['international'] -> id = 'international';
				$result -> statistics['type'] -> data['international'] -> name = JText :: _('INTERNATIONAL_ORGANIZATION');
				$result -> statistics['type'] -> data['international'] -> count = $international['true'] -> count;
			}
			$enterprise = $this -> parseStatistics($xpath, self :: ORGANIZATION_ENTERPRISE);
			if (($enterprise != NULL) && array_key_exists('true', $enterprise)) {
				$result -> statistics['type'] -> data['enterprise'] = new JObject();
				$result -> statistics['type'] -> data['enterprise'] -> id = 'enterprise';
				$result -> statistics['type'] -> data['enterprise'] -> name = JText :: _('ENTERPRISE');
				$result -> statistics['type'] -> data['enterprise'] -> count = $enterprise['true'] -> count;
			}
			$smallMediumEnterprise = $this -> parseStatistics($xpath, self :: ORGANIZATION_SMALL_MEDIUM_ENTERPRISE);
			if (($smallMediumEnterprise != NULL) && array_key_exists('true', $smallMediumEnterprise)) {
				$result -> statistics['type'] -> data['smallMediumEnterprise'] = new JObject();
				$result -> statistics['type'] -> data['smallMediumEnterprise'] -> id = 'smallMediumEnterprise';
				$result -> statistics['type'] -> data['smallMediumEnterprise'] -> name = JText :: _('SMALL_MEDIUM_ENTERPRISE');
				$result -> statistics['type'] -> data['smallMediumEnterprise'] -> count = $smallMediumEnterprise['true'] -> count;
			}
			uasort($result -> statistics['type'] -> data, function ($row1, $row2) {return $row2 -> count - $row1 -> count;});
			JLog :: add('Browse retrieved ' . count($result -> organizations) . ' organizations in ' . (microtime(TRUE) - $time) . ' s (country: ' . (($country == NULL) ? 'null' : $country) . ', type: ' . (($type == NULL) ? 'null' : $type) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing organization browse (country: ' . (($country == NULL) ? 'null' : $country) . ', type: ' . (($type == NULL) ? 'null' : $type) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}

	// Perform a browse for datasources.
	// $type the ID of the datasource type to use as filter or NULL for no datasource type filtering
	// $language the ID of the datasource language to use as filter or NULL for no datasource language filtering
	// $content the ID of the content to use as filter or NULL for no content filtering
	// $compatibility the ID of the compatibility level to use as filter or NULL for no compatibility status filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing datasources and statistics
	private function _browseDatasources($type, $language, $content, $compatibility, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: DATASOURCE_QUERY;
			$query .= ($type == NULL) ? '' : (' and ('. self :: DATASOURCE_TYPE . ' exact "' . $type . '")');
			$query .= ($language == NULL) ? '' : (' and ('. self :: DATASOURCE_LANGUAGE . ' exact "' . $language . '")');
			$query .= ($content == NULL) ? '' : (' and ('. self :: DATASOURCE_CONTENT . ' exact "' . $content . '")');
			$query .= ($compatibility == NULL) ? '' : (' and ('. self :: DATASOURCE_COMPATIBILITY . ' exact "' . $compatibility . '")');
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=datasources_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: DATASOURCE_TYPE . '&fields=' . self :: DATASOURCE_LANGUAGE . '&fields=' . self :: DATASOURCE_CONTENT . '&fields=' . self :: DATASOURCE_COMPATIBILITY . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalDatasources = $this -> parseTotalResults($xpath);
			$result -> datasources = $this -> parseDatasources($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('type', 'languageFilter', 'content', 'compatibility'), array('DATASOURCE_TYPE', 'DATASOURCE_LANGUAGE', 'CONTENT', 'COMPATIBILITY'), array('NO_DATASOURCE_TYPE_STATISTICS_FOUND', 'NO_DATASOURCE_LANGUAGE_STATISTICS_FOUND', 'NO_CONTENT_STATISTICS_FOUND', 'NO_COMPATIBILITY_STATISTICS_FOUND'), array(self :: DATASOURCE_TYPE, self :: DATASOURCE_LANGUAGE, self :: DATASOURCE_CONTENT, self :: DATASOURCE_COMPATIBILITY));			
			JLog :: add('Browse retrieved ' . count($result -> datasources) . ' datasources in ' . (microtime(TRUE) - $time) . ' s (type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', content: ' . (($content == NULL) ? 'null' : $content) . ', compatibility: ' . (($compatibility == NULL) ? 'null' : $compatibility) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing datasource browse (type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', content: ' . (($content == NULL) ? 'null' : $content) . ', compatibility: ' . (($compatibility == NULL) ? 'null' : $compatibility) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}	
	}
		
	// Perform an advanced search for publications.
	// $keywords the keywords to search for (array)
	// $fields the fields to match keywords with (array - possible values are TITLE, AUTHOR, PUBLISHER and SUBJECT)
	// $constraints the constraints to apply to keywords (array - possible values are ALL and ANY)
	// $types the IDs of the publication types to search for
	// $languages the IDs of the publication languages to search for
	// $funders the IDs of the funders to search for
	// $fundingStreams the IDs of the funding streams to search for
	// $scientificAreas the IDs of the scientific areas to search for
	// $date the publication date range to search for expressed in months before current date (if -1 search for any publication date, if 0 search explicitly using $fromMonth, $fromYear, $toMonth and $toYear)
	// $fromMonth start month of the publication date range to search for if $date has value 0
	// $fromYear start year of the publication date range to search for if $date has value 0
	// $toMonth end month of the publication date range to search for if $date has value 0
	// $toYear end year of the publication date range to search for if $date has value 0
	// $accessModes the IDs of the access modes to search for
	// $datasources the IDs of the datasources to search for
	// $type the ID of the publication type to use as filter or NULL for no publication type filtering
	// $language the ID of the publication language to use as filter or NULL for no publication language filtering
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the funding stream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $year the publication year to use as filter or NULL for no publication year filtering
	// $accessMode the ID of the access mode to use as filter or NULL for no access mode filtering
	// $datasource the ID of the datasource to use as filter or NULL for no datasource filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing publications and statistics
	private function _advancedSearchPublications($keywords, $fields, $constraints, $types, $languages, $funders, $fundingStreams, $scientificAreas, $date, $fromMonth, $fromYear, $toMonth, $toYear, $accessModes, $datasources, $type, $language, $funder, $fundingStream, $scientificArea, $year, $accessMode, $datasource, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PUBLICATION_QUERY;
			for ($i = 0; ($i < count($keywords)) && ($i < count($fields)) && ($i < count($constraints)); $i++) {
				$tokens = preg_split('/\s/', $keywords[$i], NULL, PREG_SPLIT_NO_EMPTY);
				switch ($constraints[$i]) {
				case OpenAireViewAdvancedSearchPublications :: ALL:
					$operator = ' and ';
					break;
				case OpenAireViewAdvancedSearchPublications :: ANY:
					$operator = ' or ';
					break;
				default:
					$operator = NULL;
				}
				switch ($fields[$i]) {
				case OpenAireViewAdvancedSearchPublications :: TITLE:
					$field = self :: PUBLICATION_TITLE;
					break;
				case OpenAireViewAdvancedSearchPublications :: AUTHOR:
					$field = self :: PUBLICATION_AUTHOR;
					break;
				case OpenAireViewAdvancedSearchPublications :: PUBLISHER:
					$field = self :: PUBLICATION_PUBLISHER;
					break;
				case OpenAireViewAdvancedSearchPublications :: SUBJECT:
					$field = self :: PUBLICATION_SUBJECT;
					break;
				default:
					$field = NULL;
				}
				$query .= ($tokens == NULL) ? '' : (' and (' . implode($operator, array_map(function ($keyword) use ($field) {return '(' . (($field == NULL) ? '' : ($field . ' = ')) . '"' . str_replace('"', '\\"', $keyword) . '")';}, $tokens)) . ')');
			}
			$field = self :: PUBLICATION_TYPE;
			$query .= ($types == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($type) use ($field) {return '(' . $field . ' exact "' . $type . '")';}, $types)) . ')');
			$field = self :: PUBLICATION_LANGUAGE;
			$query .= ($languages == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($language) use ($field) {return '(' . $field . ' exact "' . $language . '")';}, $languages)) . ')');
			$field = self :: PUBLICATION_FUNDER;
			$query .= ($funders == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($funder) use ($field) {return '(' . $field . ' exact "' . $funder . '")';}, $funders)) . ')');
			$field = self :: PUBLICATION_FUNDING_STREAM;
			$query .= ($fundingStreams == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($fundingStream) use ($field) {return '(' . $field . ' exact "' . $fundingStream . '")';}, $fundingStreams)) . ')');
			$field = self :: PUBLICATION_SCIENTIFIC_AREA;
			$query .= ($scientificAreas == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($scientificArea) use ($field) {return '(' . $field . ' exact "' . $scientificArea . '")';}, $scientificAreas)) . ')');
			$from = new DateTime();
			$to = new DateTime();
			switch ($date) {
			case -1:
				break;
			case 0:
				$from -> setDate($fromYear, $fromMonth, 1);
				$to -> setDate($toYear, $toMonth, 1);
				$to -> setDate($toYear, $toMonth, date('t', $to -> getTimestamp())); // update to with the last day of that month
				$query .= ' and (' . self :: PUBLICATION_DATE . ' within "' . date('Y-m-d', $from -> getTimestamp()) . ' ' . date('Y-m-d', $to -> getTimestamp()) . '")';
				break;
			default:
				$from -> sub(new DateInterval('P' . $date . 'M'));
				$query .= ' and (' . self :: PUBLICATION_DATE . ' within "' . date('Y-m-d', $from -> getTimestamp()) . ' ' . date('Y-m-d', $to -> getTimestamp()) . '")';
			}
			$field = self :: PUBLICATION_ACCESS_MODE;
			$query .= ($accessModes == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($accessMode) use ($field) {return '(' . $field . ' exact "' . $accessMode . '")';}, $accessModes)) . ')');
			$field = self :: PUBLICATION_DATASOURCE;
			$query .= ($datasources == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($datasource) use ($field) {return '(' . $field . ' exact "' . $datasource . '")';}, $datasources)) . ')');
			$query .= ($type == NULL) ? '' : (' and (' . self :: PUBLICATION_TYPE . ' exact "' . $type . '")');
			$query .= ($language == NULL) ? '' : (' and (' . self :: PUBLICATION_LANGUAGE . ' exact "' . $language . '")');
			$query .= ($funder == NULL) ? '' : (' and (' . self :: PUBLICATION_FUNDER . ' exact "' . $funder . '")');
			$query .= ($fundingStream == NULL) ? '' : (' and (' . self :: PUBLICATION_FUNDING_STREAM . ' exact "' . $fundingStream . '")');
			$query .= ($scientificArea == NULL) ? '' : (' and (' . self :: PUBLICATION_SCIENTIFIC_AREA . ' exact "' . $scientificArea . '")');
			$query .= ($year == NULL) ? '' : (' and (' . self :: PUBLICATION_YEAR . ' exact "' . $year . '")');
			$query .= ($accessMode == NULL) ? '' : (' and (' . self :: PUBLICATION_ACCESS_MODE . ' exact "' . $accessMode . '")');
			$query .= ($datasource == NULL) ? '' : (' and (' . self :: PUBLICATION_DATASOURCE . ' exact "' . $datasource . '")');
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=results_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: PUBLICATION_TYPE . '&fields=' . self :: PUBLICATION_LANGUAGE . '&fields=' . self :: PUBLICATION_FUNDER . '&fields=' . self :: PUBLICATION_FUNDING_STREAM . '&fields=' . self :: PUBLICATION_SCIENTIFIC_AREA . '&fields=' . self :: PUBLICATION_YEAR . '&fields=' . self :: PUBLICATION_ACCESS_MODE . '&fields=' . self :: PUBLICATION_DATASOURCE . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalPublications = $this -> parseTotalResults($xpath);
			$result -> publications = $this -> parsePublications($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('typeFilter', 'languageFilter', 'funderFilter', 'fundingStreamFilter', 'scientificAreaFilter', 'yearFilter', 'accessModeFilter', 'datasourceFilter'), array('DOCUMENT_TYPE', 'DOCUMENT_LANGUAGE', 'FUNDER', 'FUNDING_STREAM', 'SCIENTIFIC_AREA', 'PUBLICATION_YEAR', 'ACCESS_MODE', 'DATASOURCE'), array('NO_DOCUMENT_TYPE_STATISTICS_FOUND', 'NO_DOCUMENT_LANGUAGE_STATISTICS_FOUND', 'NO_FUNDER_STATISTICS_FOUND', 'NO_FUNDING_STREAM_STATISTICS_FOUND', 'NO_SCIENTIFIC_AREA_STATISTICS_FOUND', 'NO_PUBLICATION_YEAR_STATISTICS_FOUND', 'NO_ACCESS_MODE_STATISTICS_FOUND', 'NO_DATASOURCE_STATISTICS_FOUND'), array(self :: PUBLICATION_TYPE, self :: PUBLICATION_LANGUAGE, self :: PUBLICATION_FUNDER, self :: PUBLICATION_FUNDING_STREAM, self :: PUBLICATION_SCIENTIFIC_AREA, self :: PUBLICATION_YEAR, self :: PUBLICATION_ACCESS_MODE, self :: PUBLICATION_DATASOURCE));
			JLog :: add('Advanced search retrieved ' . count($result -> publications) . ' publications in ' . (microtime(TRUE) - $time) . ' s (keywords: [' . implode(', ', $keywords) . '], fields: [' . implode(', ', $fields) . '], constraints: [' . implode(', ', $constraints) . '], types: [' . implode(', ', $types) . '], languages: [' . implode(', ', $languages) . '], funders: [' . implode(', ', $funders) . '], funding streams: [' . implode(', ', $fundingStreams) . '], scientific areas: [' . implode(', ', $scientificAreas) . '], date: ' . $date . ', from month: ' . $fromMonth . ', from year: ' . $fromYear . ', to month: ' . $toMonth . ', to year: ' . $toYear . ', access modes: [' . implode(', ', $accessModes) . '], datasources: [' . implode(', ', $datasources) . '], type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', year: ' . (($year == NULL) ? 'null' : $year) . ', access mode: ' . (($accessMode == NULL) ? 'null' : $accessMode) . ', datasource: ' . (($datasource == NULL) ? 'null' : $datasource) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing publication advanced search (keywords: [' . implode(', ', $keywords) . '], fields: [' . implode(', ', $fields) . '], constraints: [' . implode(', ', $constraints) . '], types: [' . implode(', ', $types) . '], languages: [' . implode(', ', $languages) . '], funders: [' . implode(', ', $funders) . '], funding streams: [' . implode(', ', $fundingStreams) . '], scientific areas: [' . implode(', ', $scientificAreas) . '], date: ' . $date . ', from month: ' . $fromMonth . ', from year: ' . $fromYear . ', to month: ' . $toMonth . ', to year: ' . $toYear . ', access modes: [' . implode(', ', $accessModes) . '], datasources: [' . implode(', ', $datasources) . '], type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', year: ' . (($year == NULL) ? 'null' : $year) . ', access mode: ' . (($accessMode == NULL) ? 'null' : $accessMode) . ', datasource: ' . (($datasource == NULL) ? 'null' : $datasource) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform an advanced search for projects.
	// $keywords the keywords to search for (array)
	// $fields the fields to match keywords with (array - possible values are ACRONYM, TITLE and KEYWORDS)
	// $constraints the constraints to apply to keywords (array - possible values are ALL and ANY)
	// $funders the IDs of the funders to search for
	// $fundingStreams the IDs of the funding streams to search for
	// $scientificAreas the IDs of the scientific areas to search for
	// $startDate the start date range to search for expressed in months before current date (if -1 search for any start date, if 0 search explicitly using $startFromMonth, $startFromYear, $startToMonth and $startToYear)
	// $startFromMonth start month of the start date range to search for if $startDate has value 0
	// $startFromYear start year of the start date range to search for if $startDate has value 0
	// $startToMonth end month of the start date range to search for if $startDate has value 0
	// $startToYear end year of the start date range to search for if $startDate has value 0
	// $endDate the end date range to search for expressed in months brefore current date (if -1 search for any end date, if 0 search explicitly using $endFromMonth, $endFromYear, $endToMonth and $endToYear)
	// $endFromMonth start month of the end date range to search for if $endDate has value 0
	// $endFromYear start year of the end date range to search for if $endDate has value 0
	// $endToMonth end month of the end date range to search for if $endDate has value 0
	// $endToYear end year of the end date range to search for if $endDate has value 0
	// $sc39s the IDs of the SC-39 statuses to search for
	// $funder the ID of the funder to use as filter or NULL for no funder filtering
	// $fundingStream the ID of the funding stream to use as filter or NULL for no funding stream filtering
	// $scientificArea the ID of the scientific area to use as filter or NULL for no scientific area filtering
	// $startYear the start year to use as filter or NULL for no start year filtering
	// $endYear the end year to use as filter or NULL for no end year filtering
	// $sc39 the ID of the SC-39 status to use as filter or NULL for no SC-39 status filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing projects and statistics
	private function _advancedSearchProjects($keywords, $fields, $constraints, $funders, $fundingStreams, $scientificAreas, $startDate, $startFromMonth, $startFromYear, $startToMonth, $startToYear, $endDate, $endFromMonth, $endFromYear, $endToMonth, $endToYear, $sc39s, $funder, $fundingStream, $scientificArea, $startYear, $endYear, $sc39, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PROJECT_QUERY;
			for ($i = 0; ($i < count($keywords)) && ($i < count($fields)) && ($i < count($constraints)); $i++) {
				$tokens = preg_split('/\s/', $keywords[$i], NULL, PREG_SPLIT_NO_EMPTY);
				switch ($constraints[$i]) {
				case OpenAireViewAdvancedSearchProjects :: ALL:
					$operator = ' and ';
					break;
				case OpenAireViewAdvancedSearchProjects :: ANY:
					$operator = ' or ';
					break;
				default:
					$operator = NULL;
				}
				switch ($fields[$i]) {
				case OpenAireViewAdvancedSearchProjects :: ACRONYM:
					$field = self :: PROJECT_ACRONYM;
					break;
				case OpenAireViewAdvancedSearchProjects :: TITLE:
					$field = self :: PROJECT_TITLE;
					break;
				case OpenAireViewAdvancedSearchProjects :: KEYWORDS:
					$field = self :: PROJECT_KEYWORDS;
					break;
				default:
					$field = NULL;
				}
				$query .= ($tokens == NULL) ? '' : (' and (' . implode($operator, array_map(function ($keyword) use ($field) {return '(' . (($field == NULL) ? '' : ($field . ' = ')) . '"' . str_replace('"', '\\"', $keyword) . '")';}, $tokens)) . ')');
			}		
			$field = self :: PROJECT_FUNDER;
			$query .= ($funders == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($funder) use ($field) {return '(' . $field . ' exact "' . $funder . '")';}, $funders)) . ')');
			$field = self :: PROJECT_FUNDING_STREAM;
			$query .= ($fundingStreams == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($fundingStream) use ($field) {return '(' . $field . ' exact "' . $fundingStream . '")';}, $fundingStreams)) . ')');
			$field = self :: PROJECT_SCIENTIFIC_AREA;
			$query .= ($scientificAreas == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($scientificArea) use ($field) {return '(' . $field . ' exact "' . $scientificArea . '")';}, $scientificAreas)) . ')');
			$from = new DateTime();
			$to = new DateTime();
			switch ($startDate) {
			case -1:
				break;
			case 0:
				$from -> setDate($startFromYear, $startFromMonth, 1);
				$to -> setDate($startToYear, $startToMonth, 1);
				$to -> setDate($startToYear, $startToMonth, date('t', $to -> getTimestamp())); // update to with the last day of that month
				$query .= ' and (' . self :: PROJECT_START_DATE . ' within "' . date('Y-m-d', $from -> getTimestamp()) . ' ' . date('Y-m-d', $to -> getTimestamp()) . '")';
				break;
			default:
				$from -> sub(new DateInterval('P' . $startDate . 'M'));
				$query .= ' and (' . self :: PROJECT_START_DATE . ' within "' . date('Y-m-d', $from -> getTimestamp()) . ' ' . date('Y-m-d', $to -> getTimestamp()) . '")';
			}
			$from = new DateTime();
			$to = new DateTime();
			switch ($endDate) {
			case -1:
				break;
			case 0:
				$from -> setDate($endFromYear, $endFromMonth, 1);
				$to -> setDate($endToYear, $endToMonth, 1);
				$to -> setDate($endToYear, $endToMonth, date('t', $to -> getTimestamp())); // update to with the last day of that month
				$query .= ' and (' . self :: PROJECT_END_DATE . ' within "' . date('Y-m-d', $from -> getTimestamp()) . ' ' . date('Y-m-d', $to -> getTimestamp()) . '")';
				break;
			default:
				$from -> sub(new DateInterval('P' . $endDate . 'M'));
				$query .= ' and (' . self :: PROJECT_END_DATE . ' within "' . date('Y-m-d', $from -> getTimestamp()) . ' ' . date('Y-m-d', $to -> getTimestamp()) . '")';
			}
			$field = self :: PROJECT_SC39;
			$query .= ($sc39s == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($sc39) use ($field) {return '(' . $field . ' exact "' . ($sc39 ? 'true' : 'false') . '")';}, $sc39s)) . ')');
			$query .= ($funder == NULL) ? '' : (' and (' . self :: PROJECT_FUNDER . ' exact "' . $funder . '")');
			$query .= ($fundingStream == NULL) ? '' : (' and (' . self :: PROJECT_FUNDING_STREAM . ' exact "' . $fundingStream . '")');
			$query .= ($scientificArea == NULL) ? '' : (' and (' . self :: PROJECT_SCIENTIFIC_AREA . ' exact "' . $scientificArea . '")');
			$query .= ($startYear == NULL) ? '' : (' and (' . self :: PROJECT_START_YEAR . ' exact "' . $startYear . '")');
			$query .= ($endYear == NULL) ? '' : (' and (' . self :: PROJECT_END_YEAR . ' exact "' . $endYear . '")');
			$query .= ($sc39 === NULL) ? '' : (' and (' . self :: PROJECT_SC39 . ' exact "' . ($sc39 ? 'true' : 'false') . '")');
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=projects_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: PROJECT_FUNDER . '&fields=' . self :: PROJECT_FUNDING_STREAM . '&fields=' . self :: PROJECT_SCIENTIFIC_AREA . '&fields=' . self :: PROJECT_START_YEAR . '&fields=' . self :: PROJECT_END_YEAR . '&fields=' . self :: PROJECT_SC39 . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalProjects = $this -> parseTotalResults($xpath);
			$result -> projects = $this -> parseProjects($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('funderFilter', 'fundingStreamFilter', 'scientificAreaFilter', 'startYearFilter', 'endYearFilter', 'sc39Filter'), array('FUNDER', 'FUNDING_STREAM', 'SCIENTIFIC_AREA', 'START_YEAR', 'END_YEAR', 'SPECIAL_CLAUSE_39'), array('NO_FUNDER_STATISTICS_FOUND', 'NO_FUNDING_STREAM_STATISTICS_FOUND', 'NO_SCIENTIFIC_AREA_STATISTICS_FOUND', 'NO_START_YEAR_STATISTICS_FOUND', 'NO_END_YEAR_STATISTICS_FOUND', 'NO_SPECIAL_CLAUSE_39_STATISTICS_FOUND'), array(self :: PROJECT_FUNDER, self :: PROJECT_FUNDING_STREAM, self :: PROJECT_SCIENTIFIC_AREA, self :: PROJECT_START_YEAR, self :: PROJECT_END_YEAR, self :: PROJECT_SC39));
			JLog :: add('Advanced search retrieved ' . count($result -> projects) . ' projects in ' . (microtime(TRUE) - $time) . ' s (keywords: [' . implode(', ', $keywords) . '], fields: [' . implode(', ', $fields) . '], constraints: [' . implode(', ', $constraints) . '], funders: [' . implode(', ', $funders) . '], funding streams: [' . implode(', ', $fundingStreams) . '], scientific areas: [' . implode(', ', $scientificAreas) . '], start date: ' . $startDate . ', start from month: ' . $startFromMonth . ', start from year: ' . $startFromYear . ', start to month: ' . $startToMonth . ', start to year: ' . $startToYear . ', end date: ' . $endDate . ', end from month: ' . $endFromMonth . ', end from year: ' . $endFromYear . ', end to month: ' . $endToMonth . ', end to year: ' . $endToYear . ', SC-39s: [' . implode(', ', array_map(function ($sc39) {return $sc39 ? 'true' : 'false';}, $sc39s)) . '], funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', start year: ' . (($startYear == NULL) ? 'null' : $startYear) . ', end year: ' . (($endYear == NULL) ? 'null' : $endYear) . ', SC-39: ' . (($sc39 === NULL) ? 'null' : ($sc39 ? 'true' : 'false')) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing publication advanced search (keywords: [' . implode(', ', $keywords) . '], fields: [' . implode(', ', $fields) . '], constraints: [' . implode(', ', $constraints) . '], funders: [' . implode(', ', $funders) . '], funding streams: [' . implode(', ', $fundingStreams) . '], scientific areas: [' . implode(', ', $scientificAreas) . '], start date: ' . $startDate . ', start from month: ' . $startFromMonth . ', start from year: ' . $startFromYear . ', start to month: ' . $startToMonth . ', start to year: ' . $startToYear . ', end date: ' . $endDate . ', end from month: ' . $endFromMonth . ', end from year: ' . $endFromYear . ', end to month: ' . $endToMonth . ', end to year: ' . $endToYear . ', SC-39s: [' . implode(', ', array_map(function ($sc39) {return $sc39 ? 'true' : 'false';}, $sc39s)) . '], funder: ' . (($funder == NULL) ? 'null' : $funder) . ', funding stream: ' . (($fundingStream == NULL) ? 'null' : $fundingStream) . ', scientific area: ' . (($scientificArea == NULL) ? 'null' : $scientificArea) . ', start year: ' . (($startYear == NULL) ? 'null' : $startYear) . ', end year: ' . (($endYear == NULL) ? 'null' : $endYear) . ', SC-39: ' . (($sc39 === NULL) ? 'null' : ($sc39 ? 'true' : 'false')) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform an advanced search for people.
	// $keywords the keywords to search for (array)
	// $fields the fields to match keywords with (array - possible values are LAST_NAME, FIRST_NAME and FULL_NAME)
	// $constraints the constraints to apply to keywords (array - possible values are ALL and ANY)
	// $countries the IDs of the countries to search for
	// $country the ID of the coutnry to use as filter or NULL for no country filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing people and statistics
	private function _advancedSearchPeople($keywords, $fields, $constraints, $countries, $country, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PERSON_QUERY;
			for ($i = 0; ($i < count($keywords)) && ($i < count($fields)) && ($i < count($constraints)); $i++) {
				$tokens = preg_split('/\s/', $keywords[$i], NULL, PREG_SPLIT_NO_EMPTY);
				switch ($constraints[$i]) {
				case OpenAireViewAdvancedSearchPeople :: ALL:
					$operator = ' and ';
					break;
				case OpenAireViewAdvancedSearchPeople :: ANY:
					$operator = ' or ';
					break;
				default:
					$operator = NULL;
				}
				switch ($fields[$i]) {
				case OpenAireViewAdvancedSearchPeople :: LAST_NAME:
					$field = self :: PERSON_LAST_NAME;
					break;
				case OpenAireViewAdvancedSearchPeople :: FIRST_NAME:
					$field = self :: PERSON_FIRST_NAME;
					break;
				case OpenAireViewAdvancedSearchPeople :: FULL_NAME:
					$field = self :: PERSON_FULL_NAME;
					break;
				default:
					$field = NULL;
				}
				$query .= ($tokens == NULL) ? '' : (' and (' . implode($operator, array_map(function ($keyword) use ($field) {return '(' . (($field == NULL) ? '' : ($field . ' = ')) . '"' . str_replace('"', '\\"', $keyword) . '")';}, $tokens)) . ')');
			}
			$field = self :: PERSON_COUNTRY;
			$query .= ($countries == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($country) use ($field) {return '(' . $field . ' exact "' . $country . '")';}, $countries)) . ')');
			$query .= ($country == NULL) ? '' : (' and (' . self :: PERSON_COUNTRY . ' exact "' . $country . '")');
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=persons_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: PERSON_COUNTRY . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalPeople = $this -> parseTotalResults($xpath);
			$result -> people = $this -> parsePeople($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('countryFilter'), array('COUNTRY'), array('NO_COUNTRY_STATISTICS_FOUND'), array(self :: PERSON_COUNTRY));
			JLog :: add('Advanced search retrieved ' . count($result -> people) . ' people in ' . (microtime(TRUE) - $time) . ' s (keywords: [' . implode(', ', $keywords) . '], fields: [' . implode(', ', $fields) . '], constraints: [' . implode(', ', $constraints) . '], countries: [' . implode(', ', $countries) . '], country: ' . (($country == NULL) ? 'null' : $country) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing datasource advanced search (keywords: [' . implode(', ', $keywords) . '], fields: [' . implode(', ', $fields) . '], constraints: [' . implode(', ', $constraints) . '], countries: [' . implode(', ', $countries) . '], country: ' . (($country == NULL) ? 'null' : $country) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform an advanced search for organizations.
	// $keywords the keywords to search for (array)
	// $fields the fields to match keywords with (array - possible values are NAME and SHORT_NAME)
	// $constraints the constraints to apply to keywords (array - possible values are ALL and ANY)
	// $countries the IDs of the countries to search for
	// $types the IDs of the organization types to search for
	// $country the ID of the coutnry to use as filter or NULL for no country filtering
	// $type the ID of the organization type to use as filter or NULL for no organization type filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing organizations and statistics
	private function _advancedSearchOrganizations($keywords, $fields, $constraints, $countries, $types, $country, $type, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: ORGANIZATION_QUERY;
			for ($i = 0; ($i < count($keywords)) && ($i < count($fields)) && ($i < count($constraints)); $i++) {
				$tokens = preg_split('/\s/', $keywords[$i], NULL, PREG_SPLIT_NO_EMPTY);
				switch ($constraints[$i]) {
				case OpenAireViewAdvancedSearchPeople :: ALL:
					$operator = ' and ';
					break;
				case OpenAireViewAdvancedSearchPeople :: ANY:
					$operator = ' or ';
					break;
				default:
					$operator = NULL;
				}
				switch ($fields[$i]) {
				case OpenAireViewAdvancedSearchOrganizations :: NAME:
					$field = self :: ORGANIZATION_NAME;
					break;
				case OpenAireViewAdvancedSearchOrganizations :: SHORT_NAME:
					$field = self :: ORGANIZATION_SHORT_NAME;
					break;
				default:
					$field = NULL;
				}
				$query .= ($tokens == NULL) ? '' : (' and (' . implode($operator, array_map(function ($keyword) use ($field) {return '(' . (($field == NULL) ? '' : ($field . ' = ')) . '"' . str_replace('"', '\\"', $keyword) . '")';}, $tokens)) . ')');
			}
			$field = self :: ORGANIZATION_COUNTRY;
			$query .= ($countries == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($country) use ($field) {return '(' . $field . ' exact "' . $country . '")';}, $countries)) . ')');
			$organizationLegalBody = self :: ORGANIZATION_LEGAL_BODY;
			$organizationLegalPerson = self :: ORGANIZATION_LEGAL_PERSON;
			$organizationNonProfit = self :: ORGANIZATION_NON_PROFIT;
			$organizationResearch = self :: ORGANIZATION_RESEARCH;
			$organizationEuInterests = self :: ORGANIZATION_EU_INTERESTS;
			$organizationInternational = self :: ORGANIZATION_INTERNATIONAL;
			$organizationEnterprise = self :: ORGANIZATION_ENTERPRISE;
			$organizationSmallMediumEnterprise = self :: ORGANIZATION_SMALL_MEDIUM_ENTERPRISE;
			$query .= ($types == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($type) use ($organizationLegalBody, $organizationLegalPerson, $organizationNonProfit, $organizationResearch, $organizationEuInterests, $organizationInternational, $organizationEnterprise, $organizationSmallMediumEnterprise) {switch ($type) {case 'legalBody': return '(' . $organizationLegalBody . ' exact true)'; case 'legalPerson': return '(' . $organizationLegalPerson . ' exact true)'; case 'nonProfit': return '(' . $organizationNonProfit . ' exact true)'; case 'research': return '(' . $organizationResearch . ' exact true)'; case 'euInterests': return '(' . $organizationEuInterests . ' exact true)'; case 'international': return '(' . $organizationInternational . ' exact true)'; case 'enterprise': return '(' . $organizationEnterprise . ' exact true)'; case 'smallMediumEnterprise': return '(' . $organizationSmallMediumEnterprise . ' exact true)';}}, $types)) . ')');
			$query .= ($country == NULL) ? '' : (' and (' . self :: ORGANIZATION_COUNTRY . ' exact "' . $country . '")');
			switch ($type) {
			case 'legalBody':
				$query .= ' and (' . self :: ORGANIZATION_LEGAL_BODY . ' exact true)';
				break;
			case 'legalPerson':
				$query .= ' and (' . self :: ORGANIZATION_LEGAL_PERSON . ' exact true)';
				break;
			case 'nonProfit':
				$query .= ' and (' . self :: ORGANIZATION_NON_PROFIT . ' exact true)';
				break;
			case 'research':
				$query .= ' and (' . self :: ORGANIZATION_RESEARCH . ' exact true)';
				break;
			case 'euInterests':
				$query .= ' and (' . self :: ORGANIZATION_EU_INTERESTS . ' exact true)';
				break;
			case 'international':
				$query .= ' and (' . self :: ORGANIZATION_INTERNATIONAL . ' exact true)';
				break;
			case 'enterprise':
				$query .= ' and (' . self :: ORGANIZATION_ENTERPRISE . ' exact true)';
				break;
			case 'smallMediumEnterprise':
				$query .= ' and (' . self :: ORGANIZATION_SMALL_MEDIUM_ENTERPRISE . ' exact true)';
			}
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=organizations_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: ORGANIZATION_COUNTRY . '&fields=' . self :: ORGANIZATION_LEGAL_BODY . '&fields=' . self :: ORGANIZATION_LEGAL_PERSON . '&fields=' . self :: ORGANIZATION_NON_PROFIT . '&fields=' . self :: ORGANIZATION_RESEARCH . '&fields=' . self :: ORGANIZATION_EU_INTERESTS . '&fields=' . self :: ORGANIZATION_INTERNATIONAL . '&fields=' . self :: ORGANIZATION_ENTERPRISE . '&fields=' . self :: ORGANIZATION_SMALL_MEDIUM_ENTERPRISE . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalOrganizations = $this -> parseTotalResults($xpath);
			$result -> organizations = $this -> parseOrganizations($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('countryFilter'), array('COUNTRY'), array('NO_COUNTRY_STATISTICS_FOUND'), array(self :: ORGANIZATION_COUNTRY));
			$result -> statistics['typeFilter'] = new JObject();
			$result -> statistics['typeFilter'] -> id = 'typeFilter';
			$result -> statistics['typeFilter'] -> title = JText :: _('ORGANIZATION_TYPE');
			$result -> statistics['typeFilter'] -> error = JText :: _('NO_ORGANIZATION_TYPE_STATISTICS_FOUND');
			$result -> statistics['typeFilter'] -> data = array();
			$legalBody = $this -> parseStatistics($xpath, self :: ORGANIZATION_LEGAL_BODY);
			if (($legalBody != NULL) && array_key_exists('true', $legalBody)) {
				$result -> statistics['typeFilter'] -> data['legalBody'] = new JObject();
				$result -> statistics['typeFilter'] -> data['legalBody'] -> id = 'legalBody';
				$result -> statistics['typeFilter'] -> data['legalBody'] -> name = JText :: _('LEGAL_BODY');
				$result -> statistics['typeFilter'] -> data['legalBody'] -> count = $legalBody['true'] -> count;
			}
			$legalPerson = $this -> parseStatistics($xpath, self :: ORGANIZATION_LEGAL_PERSON);
			if (($legalPerson != NULL) && array_key_exists('true', $legalPerson)) {
				$result -> statistics['typeFilter'] -> data['legalPerson'] = new JObject();
				$result -> statistics['typeFilter'] -> data['legalPerson'] -> id = 'legalPerson';
				$result -> statistics['typeFilter'] -> data['legalPerson'] -> name = JText :: _('LEGAL_PERSON');
				$result -> statistics['typeFilter'] -> data['legalPerson'] -> count = $legalPerson['true'] -> count;
			}
			$nonProfit = $this -> parseStatistics($xpath, self :: ORGANIZATION_NON_PROFIT);
			if (($nonProfit != NULL) && array_key_exists('true', $nonProfit)) {
				$result -> statistics['typeFilter'] -> data['nonProfit'] = new JObject();
				$result -> statistics['typeFilter'] -> data['nonProfit'] -> id = 'nonProfit';
				$result -> statistics['typeFilter'] -> data['nonProfit'] -> name = JText :: _('NON_PROFIT_ORGANIZATION');
				$result -> statistics['typeFilter'] -> data['nonProfit'] -> count = $nonProfit['true'] -> count;
			}
			$research = $this -> parseStatistics($xpath, self :: ORGANIZATION_RESEARCH);
			if (($research != NULL) && array_key_exists('true', $research)) {
				$result -> statistics['typeFilter'] -> data['research'] = new JObject();
				$result -> statistics['typeFilter'] -> data['research'] -> id = 'research';
				$result -> statistics['typeFilter'] -> data['research'] -> name = JText :: _('RESEARCH_ORGANIZATION');
				$result -> statistics['typeFilter'] -> data['research'] -> count = $research['true'] -> count;
			}			
			$euInterests = $this -> parseStatistics($xpath, self :: ORGANIZATION_EU_INTERESTS);
			if (($euInterests != NULL) && array_key_exists('true', $euInterests)) {
				$result -> statistics['typeFilter'] -> data['euInterests'] = new JObject();
				$result -> statistics['typeFilter'] -> data['euInterests'] -> id = 'euInterests';
				$result -> statistics['typeFilter'] -> data['euInterests'] -> name = JText :: _('EU_INTERESTS_ORGANIZATION');
				$result -> statistics['typeFilter'] -> data['euInterests'] -> count = $euInterests['true'] -> count;
			}
			$international = $this -> parseStatistics($xpath, self :: ORGANIZATION_INTERNATIONAL);
			if (($international != NULL) && array_key_exists('true', $international)) {
				$result -> statistics['typeFilter'] -> data['international'] = new JObject();
				$result -> statistics['typeFilter'] -> data['international'] -> id = 'international';
				$result -> statistics['typeFilter'] -> data['international'] -> name = JText :: _('INTERNATIONAL_ORGANIZATION');
				$result -> statistics['typeFilter'] -> data['international'] -> count = $international['true'] -> count;
			}
			$enterprise = $this -> parseStatistics($xpath, self :: ORGANIZATION_ENTERPRISE);
			if (($enterprise != NULL) && array_key_exists('true', $enterprise)) {
				$result -> statistics['typeFilter'] -> data['enterprise'] = new JObject();
				$result -> statistics['typeFilter'] -> data['enterprise'] -> id = 'enterprise';
				$result -> statistics['typeFilter'] -> data['enterprise'] -> name = JText :: _('ENTERPRISE');
				$result -> statistics['typeFilter'] -> data['enterprise'] -> count = $enterprise['true'] -> count;
			}
			$smallMediumEnterprise = $this -> parseStatistics($xpath, self :: ORGANIZATION_SMALL_MEDIUM_ENTERPRISE);
			if (($smallMediumEnterprise != NULL) && array_key_exists('true', $smallMediumEnterprise)) {
				$result -> statistics['typeFilter'] -> data['smallMediumEnterprise'] = new JObject();
				$result -> statistics['typeFilter'] -> data['smallMediumEnterprise'] -> id = 'smallMediumEnterprise';
				$result -> statistics['typeFilter'] -> data['smallMediumEnterprise'] -> name = JText :: _('SMALL_MEDIUM_ENTERPRISE');
				$result -> statistics['typeFilter'] -> data['smallMediumEnterprise'] -> count = $smallMediumEnterprise['true'] -> count;
			}
			uasort($result -> statistics['typeFilter'] -> data, function ($row1, $row2) {return $row2 -> count - $row1 -> count;});
			JLog :: add('Advanced search retrieved ' . count($result -> organizations) . ' organizations in ' . (microtime(TRUE) - $time) . ' s (keywords: [' . implode(', ', $keywords) . '], fields: [' . implode(', ', $fields) . '], constraints: [' . implode(', ', $constraints) . '], countries: [' . implode(', ', $countries) . '], types: [' . implode(', ', $types) . '], country: ' . (($country == NULL) ? 'null' : $country) . ', type: ' . (($type == NULL) ? 'null' : $type) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing organization advanced search (keywords: [' . implode(', ', $keywords) . '], fields: [' . implode(', ', $fields) . '], constraints: [' . implode(', ', $constraints) . '], countries: [' . implode(', ', $countries) . '], types: [' . implode(', ', $types) . '], country: ' . (($country == NULL) ? 'null' : $country) . ', type: ' . (($type == NULL) ? 'null' : $type) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform an advanced search for datasources.
	// $keywords the keywords to search for (array)
	// $fields the fields to match keywords with (array - possible values are NAME, ENGLISH_NAME and SUBJECT)
	// $constraints the constraints to apply to keywords (array - possible values are ALL and ANY)
	// $types the IDs of the datasource types to search for
	// $languages the IDs of the datasource languages to search for
	// $contents the IDs of the contents to search for
	// $compatibilities the IDs of the compatibilities to search for
	// $type the ID of the datasource type to use as filter or NULL for no datasource type filtering
	// $language the ID of the datasource language to use as filter or NULL for no datasource language filtering
	// $content the ID of the content to use as filter or NULL for no content filtering
	// $compatibility the ID of the compatibility to use as filter or NULL for no compatibility filtering
	// $page the page of results to retrieve
	// $size the size of the page of results to retrieve
	// $locale the locale to use
	// return a result (object) containing datasources and statistics
	private function _advancedSearchDatasources($keywords, $fields, $constraints, $types, $languages, $contents, $compatibilities, $type, $language, $content, $compatibility, $page, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: DATASOURCE_QUERY;
			for ($i = 0; ($i < count($keywords)) && ($i < count($fields)) && ($i < count($constraints)); $i++) {
				$tokens = preg_split('/\s/', $keywords[$i], NULL, PREG_SPLIT_NO_EMPTY);
				switch ($constraints[$i]) {
				case OpenAireViewAdvancedSearchDatasources :: ALL:
					$operator = ' and ';
					break;
				case OpenAireViewAdvancedSearchDatasources :: ANY:
					$operator = ' or ';
					break;
				default:
					$operator = NULL;
				}
				switch ($fields[$i]) {
				case OpenAireViewAdvancedSearchDatasources :: NAME:
					$field = self :: DATASOURCE_NAME;
					break;
				case OpenAireViewAdvancedSearchDatasources :: ENGLISH_NAME:
					$field = self :: DATASOURCE_ENGLISH_NAME;
					break;
				case OpenAireViewAdvancedSearchDatasources :: SUBJECT:
					$field = self :: DATASOURCE_SUBJECT;
					break;
				default:
					$field = NULL;
				}
				$query .= ($tokens == NULL) ? '' : (' and (' . implode($operator, array_map(function ($keyword) use ($field) {return '(' . (($field == NULL) ? '' : ($field . ' = ')) . '"' . str_replace('"', '\\"', $keyword) . '")';}, $tokens)) . ')');
			}
			$field = self :: DATASOURCE_TYPE;
			$query .= ($types == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($type) use ($field) {return '(' . $field . ' exact "' . $type . '")';}, $types)) . ')');
			$field = self :: DATASOURCE_LANGUAGE;
			$query .= ($languages == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($language) use ($field) {return '(' . $field . ' exact "' . $language . '")';}, $languages)) . ')');
			$field = self :: DATASOURCE_CONTENT;
			$query .= ($contents == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($content) use ($field) {return '(' . $field . ' exact "' . $content . '")';}, $contents)) . ')');
			$field = self :: DATASOURCE_COMPATIBILITY;
			$query .= ($compatibilities == NULL) ? '' : (' and (' . implode(' or ', array_map(function ($compatibility) use ($field) {return '(' . $field . ' exact "' . $compatibility . '")';}, $compatibilities)) . ')');
			$query .= ($type == NULL) ? '' : (' and (' . self :: DATASOURCE_TYPE . ' exact "' . $type . '")');
			$query .= ($language == NULL) ? '' : (' and (' . self :: DATASOURCE_LANGUAGE . ' exact "' . $language . '")');
			$query .= ($content == NULL) ? '' : (' and (' . self :: DATASOURCE_CONTENT . ' exact "' . $content . '")');
			$query .= ($compatibility == NULL) ? '' : (' and (' . self :: DATASOURCE_COMPATIBILITY . ' exact "' . $compatibility . '")');
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=searchNrefine&sTransformer=datasources_openaire&rTransformer=results_openaire_browse&query=' . urlencode($query) . '&page=' . $page . '&size=' . $size . '&fields=' . self :: DATASOURCE_TYPE . '&fields=' . self :: DATASOURCE_LANGUAGE . '&fields=' . self :: DATASOURCE_CONTENT . '&fields=' . self :: DATASOURCE_COMPATIBILITY . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalDatasources = $this -> parseTotalResults($xpath);
			$result -> datasources = $this -> parseDatasources($xpath);
			$result -> statistics = $this -> createStatistics($xpath, array('typeFilter', 'languageFilter', 'contentFilter', 'compatibilityFilter'), array('DATASOURCE_TYPE', 'DATASOURCE_LANGUAGE', 'CONTENT', 'COMPATIBILITY'), array('NO_DATASOURCE_TYPE_STATISTICS_FOUND', 'NO_DATASOURCE_LANGUAGE_STATISTICS_FOUND', 'NO_CONTENT_STATISTICS_FOUND', 'NO_COMPATIBILITY_STATISTICS_FOUND'), array(self :: DATASOURCE_TYPE, self :: DATASOURCE_LANGUAGE, self :: DATASOURCE_CONTENT, self :: DATASOURCE_COMPATIBILITY));
			JLog :: add('Advanced search retrieved ' . count($result -> datasources) . ' datasources in ' . (microtime(TRUE) - $time) . ' s (keywords: [' . implode(', ', $keywords) . '], fields: [' . implode(', ', $fields) . '], constraints: [' . implode(', ', $constraints) . '], types: [' . implode(', ', $types) . '], languages: [' . implode(', ', $languages) . '], contents: [' . implode(', ', $contents) . '], compatibilities: [' . implode(', ', $compatibilities) . '], type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', content: ' . (($content == NULL) ? 'null' : $content) . ', compatibility: ' . (($compatibility == NULL) ? 'null' : $compatibility) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error performing datasource advanced search (keywords: [' . implode(', ', $keywords) . '], fields: [' . implode(', ', $fields) . '], constraints: [' . implode(', ', $constraints) . '], types: [' . implode(', ', $types) . '], languages: [' . implode(', ', $languages) . '], contents: [' . implode(', ', $contents) . '], compatibilities: [' . implode(', ', $compatibilities) . '], type: ' . (($type == NULL) ? 'null' : $type) . ', language: ' . (($language == NULL) ? 'null' : $language) . ', content: ' . (($content == NULL) ? 'null' : $content) . ', compatibility: ' . (($compatibility == NULL) ? 'null' : $compatibility) . ', page: ' . $page . ', size: ' . $size . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Retrieve a single publication by identifier.
	// $id the publication identifier
	// $locale the locale to use
	// return a publication (object) or NULL if no such publication exists
	private function _getPublication($id, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PUBLICATION_QUERY . ' and (' . self :: PUBLICATION_ID . ' exact "' . $id . '")';
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=search&sTransformer=results_openaire&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$publication = $this -> parsePublication($xpath, $locale);
			JLog :: add('Retrieved publication in ' . (microtime(TRUE) - $time) . ' s (id: ' . $id . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $publication;
		} catch (Exception $e) {
			JLog :: add('Error retrieving publication (id: ' . $id . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
        // Retrieve results by identifier.
	// $ids the result identifiers
	// $locale the locale to use
	// return a result (object) or NULL if no such result exists
	private function _getResults($ids, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: RESULT_QUERY . ' and (';
                        $parts = array();
                        foreach ($ids as $id){
                            $parts[] = ('(' . self :: RESULT_ID . ' exact "' . $id . '")');
                        }
                        $query .= join(" OR ", $parts);
                        $query .= ')';
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=search&sTransformer=results_openaire&query=' . urlencode($query) . '&size=10000&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$results = $this -> parseResults($xpath, $locale);
			JLog :: add('Retrieved results in ' . (microtime(TRUE) - $time) . ' s (ids: ' . join(",", $ids) . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $results;
		} catch (Exception $e) {
			JLog :: add('Error retrieving results (id: ' . $id . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	// Retrieve publications by identifier.
	// $ids the publication identifiers
	// $locale the locale to use
	// return a publication (object) or NULL if no such publication exists
	private function _getPublications($ids, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PUBLICATION_QUERY . ' and (';
                        $parts = array();
                        foreach ($ids as $id){
                            $parts[] = '(' . self :: PUBLICATION_ID . ' exact "' . $id . '")';
                        }
                        $query .= join(" OR ", $parts);
                        $query .= ')';
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=search&sTransformer=results_openaire&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$publications = $this -> parsePublications($xpath, $locale);
			JLog :: add('Retrieved publication in ' . (microtime(TRUE) - $time) . ' s (ids: ' . join(",", $ids) . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $publications;
		} catch (Exception $e) {
			JLog :: add('Error retrieving publication (id: ' . $id . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
        
        // Retrieve publications by identifier.
	// $ids the publication identifiers
	// $locale the locale to use
	// return a publication (object) or NULL if no such publication exists
	private function _getProjects($ids, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PROJECT_QUERY . ' and (';
                        $parts = array();
                        foreach ($ids as $id){
                            $parts[] = '(' . self :: PROJECT_ID . ' exact "' . $id . '")';
                        }
                        $query .= join(" OR ", $parts);
                        $query .= ')';
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=search&sTransformer=projects_openaire&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$projects = $this -> parseProjects($xpath, $locale);
			JLog :: add('Retrieved projects in ' . (microtime(TRUE) - $time) . ' s (ids: ' . join(",", $ids) . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $projects;
		} catch (Exception $e) {
			JLog :: add('Error retrieving projects (ids: ' . join(",", $ids) . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
        
        // Retrieve datasets by identifier.
	// $ids the datasets identifiers
	// $locale the locale to use
	// return datasets array of (object) or NULL if no such dataset exists
	private function _getDatasets($ids, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: DATASET_QUERY . ' and (';
                        $parts = array();
                        foreach ($ids as $id){
                            $parts[] = '(' . self :: DATASET_ID . ' exact "' . $id . '")';
                        }
                        $query .= join(" OR ", $parts);
                        $query .= ')';
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=search&sTransformer=results_openaire&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$datasets = $this -> parseDatasets($xpath, $locale);
			JLog :: add('Retrieved publication in ' . (microtime(TRUE) - $time) . ' s (ids: ' . join(",", $ids) . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $datasets;
		} catch (Exception $e) {
			JLog :: add('Error retrieving publication (id: ' . $id . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	// Retrieve a single dataset by identifier.
	// $id the dataset identifier
	// $locale the locale to use
	// return a dataset (object) or NULL if no such dataset exists
	private function _getDataset($id, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: DATASET_QUERY . ' and (' . self :: DATASET_ID . ' exact "' . $id . '")';
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=search&sTransformer=results_openaire&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$dataset = $this -> parseDataset($xpath,$locale);
			JLog :: add('Retrieved dataset in ' . (microtime(TRUE) - $time) . ' s (id: ' . $id . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $dataset;
		} catch (Exception $e) {
			JLog :: add('Error retrieving dataset (id: ' . $id . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Retrieve a single project by identifier.
	// $id the project identifier
	// $locale the locale to use
	// return a project (object) or NULL if no such project exists
	private function _getProject($id, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PROJECT_QUERY . ' and (' . self :: PROJECT_ID . ' exact "' . $id . '")';
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=search&sTransformer=projects_openaire&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$project = $this -> parseProject($xpath);
			JLog :: add('Retrieved project in ' . (microtime(TRUE) - $time) . ' s (id: ' . $id . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $project;
		} catch (Exception $e) {
			JLog :: add('Error retrieving project (id: ' . $id . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Retrieve a single person by identifier.
	// $id the person identifier
	// $locale the locale to use
	// return a person (object) or NULL if no such person exists
	private function _getPerson($id, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PERSON_QUERY . ' and (' . self :: PERSON_ID . ' exact "' . $id . '")';
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=search&sTransformer=persons_openaire&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$person = $this -> parsePerson($xpath);
			JLog :: add('Retrieved person in ' . (microtime(TRUE) - $time) . ' s (id: ' . $id . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $person;
		} catch (Exception $e) {
			JLog :: add('Error retrieving person (id: ' . $id . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Retrieve a single organization by identifier.
	// $id the organization identifier
	// $locale the locale to use
	// return an organization (object) or NULL if no such organization exists
	private function _getOrganization($id, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: ORGANIZATION_QUERY . ' and (' . self :: ORGANIZATION_ID . ' exact "' . $id . '")';
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=search&sTransformer=organizations_openaire&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$organization = $this -> parseOrganization($xpath);
			JLog :: add('Retrieved organization in ' . (microtime(TRUE) - $time) . ' s (id: ' . $id . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $organization;
		} catch (Exception $e) {
			JLog :: add('Error retrieving organization (id: ' . $id . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}

	// Retrieve the datasources of an organization.
	// $id the organization identifier
	// $size the maximum number of datasources to retrieve
	// $locale the locale to use
	// return a result (object) containing datasources and total
	private function _getOrganizationDatasources($id, $size, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: DATASOURCE_QUERY . ' and (' . self :: DATASOURCE_ORGANIZATION . ' exact "' . $id . '")';
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=search&sTransformer=datasources_openaire&query=' . urlencode($query) . '&size=' . $size . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$result = new JObject();
			$result -> totalDatasources = $this -> parseTotalResults($xpath);
			$result -> datasources = $this -> parseDatasources($xpath);
			JLog :: add('Retrieved ' . count($result -> datasources) . ' organization datasources in ' . (microtime(TRUE) - $time) . ' s (id: ' . $id . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $result;
		} catch (Exception $e) {
			JLog :: add('Error retrieving organization datasources (id: ' . $id . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Retrieve a single datasource by identifier.
	// $id the datasource identifier
	// $locale the locale to use
	// return a datasource (object) or NULL if no such datasource exists
	private function _getDatasource($id, $locale, $compatibility = false) {
		try {
			$time = microtime(TRUE);
			$datasource_query = $compatibility?self::DATASOURCE_QUERY_COMPATIBILITY:self::DATASOURCE_QUERY;
			$query = $datasource_query . ' and (' . self :: DATASOURCE_ID . ' exact "' . $id . '")';
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=search&sTransformer=datasources_openaire&query=' . urlencode($query) . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$datasource = $this -> parseDatasource($xpath);
			JLog :: add('Retrieved datasource in ' . (microtime(TRUE) - $time) . ' s (id: ' . $id . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $datasource;
		} catch (Exception $e) {
			JLog :: add('Error retrieving datasource (id: ' . $id . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Retrieve all the OpenAIRE compatible datasources.
	// $locale the locale to use
	// return the datasources (array) or NULL if any errors occur
	private function _getCompatibleDatasources($locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: DATASOURCE_QUERY . ' and (' . self :: DATASOURCE_COMPATIBILITY . ' <> "' . self :: DATASOURCE_COMPATIBILITY_NOT_COMPATIBLE . '")';
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=search&sTransformer=datasources_openaire&query=' . urlencode($query) . '&size=1&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$totalDatasources = $this -> parseTotalResults($xpath);
			if ($totalDatasources > 0) {
				if (($response = $this -> performGet('search?action=search&sTransformer=datasources_openaire&query=' . urlencode($query) . '&size=' . $totalDatasources . '&locale=' . str_replace('-', '_', $locale))) == NULL)
					throw new Exception('no HTTP response');
				if ($response -> code != self :: HTTP_OK)
					throw new Exception('HTTP response code ' . $response -> code);
				$document = new DOMDocument();
				$document -> recover = TRUE;
				if ($document -> loadXML($response -> body) == FALSE)
					throw new Exception('invalid XML response');
				$xpath = new DOMXPath($document);
				$datasources = $this -> parseDatasources($xpath);
			} else
				$datasources = array();
			JLog :: add('Retrieved ' . count($datasources) . ' compatible datasources in ' . (microtime(TRUE) - $time) . ' s (locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $datasources;
		} catch (Exception $e) {
			JLog :: add('Error retrieving compatible datasources (locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform a quick search for projects, searching only by acronym, title or code and funder.
	// $keyword the keyword to search for
	// $funder the funder to search for
	// $limit the maximum number of results to retrieve
	// $locale the locale to use
	// return projects (array) or NULL if any errors occur
	private function _quickSearchProjects($keyword, $funder, $limit, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: PROJECT_QUERY . ' and ((' . self :: PROJECT_TITLE . ' = "' . $keyword . '") or (' . self :: PROJECT_ACRONYM . ' = "' . $keyword . '") or (' . self :: PROJECT_CODE . ' = "' . $keyword . '")) and (' . self :: PROJECT_FUNDER . ' exact ' . $funder . ')';
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=search&sTransformer=projects_openaire&query=' . urlencode($query) . '&size=' . $limit . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$projects = $this -> parseProjects($xpath);
			JLog :: add('Retrieved ' . count($projects) . ' projects in ' . (microtime(TRUE) - $time) . ' s (keyword: ' . $keyword . ', funder: ' . $funder . ', limit: ' . $limit . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $projects;
		} catch (Exception $e) {
			JLog :: add('Error retrieving projects (keyword: ' . $keyword . ', funder: ' . $funder . ', limit: ' . $limit . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform a quick search for organizations, searching only by name or short name.
	// $keyword the keyword to search for
	// $limit the maximum number of results to retrieve
	// $locale the locale to use
	// return organizations (array) or NULL if any errors occur
	private function _quickSearchOrganizations($keyword, $limit, $locale) {
		try {
			$time = microtime(TRUE);
			$query = self :: ORGANIZATION_QUERY . ' and ((' . self :: ORGANIZATION_NAME . ' all "' . $keyword . '") or (' . self :: ORGANIZATION_SHORT_NAME . ' all "' . $keyword . '"))';
			JLog :: add('Generated query is \'' . $query . '\'', JLog :: INFO, self :: LOG);
			if (($response = $this -> performGet('search?action=search&sTransformer=organizations_openaire&query=' . urlencode($query) . '&size=' . $limit . '&locale=' . str_replace('-', '_', $locale))) == NULL)
				throw new Exception('no HTTP response');
			if ($response -> code != self :: HTTP_OK)
				throw new Exception('HTTP response code ' . $response -> code);
			$document = new DOMDocument();
			$document -> recover = TRUE;
			if ($document -> loadXML($response -> body) == FALSE)
				throw new Exception('invalid XML response');
			$xpath = new DOMXPath($document);
			$organizations = $this -> parseOrganizations($xpath);
			JLog :: add('Retrieved ' . count($organizations) . ' organizations in ' . (microtime(TRUE) - $time) . ' s (keyword: ' . $keyword . ', limit: ' . $limit . ', locale: ' . $locale . ')', JLog :: INFO, self :: LOG);
			return $organizations;
		} catch (Exception $e) {
			JLog :: add('Error retrieving organizations (keyword: ' . $keyword . ', limit: ' . $limit . ', locale: ' . $locale . '): ' . $e -> getMessage(), JLog :: ERROR, self :: LOG);
			return NULL;
		}
	}
	
	// Perform an HTTP GET request.
	// $request the relative URL to connect to
	// return the HTTP response (object)
	private function performGet($request) {
		$request = $this -> searchService . $request;
		JLog :: add('Requesting ' . $request, JLog :: INFO, self :: LOG);
		$time = microtime(TRUE);
		$response = $this -> http -> get($request);
		JLog :: add('Received response in ' . (microtime(TRUE) - $time) . ' s', JLog :: INFO, self :: LOG);
		return $response;
	}
	
	// Create statistics based on a search service XML response.
	// $xpath the DOMXPath to parse
	// $ids the identifiers of the statistics to create
	// $titles the titles of the statistics to create
	// $errors the error messages of the statistics to create
	// $data the field names of the statistics to create
	// return statistics (array)
	private function createStatistics($xpath, $ids, $titles, $errors, $data) {
		$statistics = array();
		array_map(function ($id, $title, $error, $data) use ($xpath, &$statistics) {$statistics[$id] = new JObject(); $statistics[$id] -> id = $id; $statistics[$id] -> title = JText :: _($title); $statistics[$id] -> error = JText :: _($error); $statistics[$id] -> data = OpenAireModelSearch :: parseStatistics($xpath, $data);}, $ids, $titles, $errors, $data);
		return $statistics;
	}
	
	// Parse statistics from a search service XML response.
	// $xpath the DOMXPath to parse
	// $category the category to retrieve statistics for
	// return statistics (associative array)
	public function parseStatistics($xpath, $category) {
		if ((($browseResultsNodes = $xpath -> query('/response/browseResults')) == FALSE) || (($browseResultsNode = $browseResultsNodes -> item(0)) == NULL))
			throw new Exception('error parsing statistics');
		if (($fieldNodes = $xpath -> query('./result/field[@name = "' . $category . '"]', $browseResultsNode)) == FALSE)
			throw new Exception('error parsing statistics');
		$statistics = array();
		foreach ($fieldNodes as $fieldNode) {
			if ((($idNodes = $xpath -> query('./field[@name = "value"]/@value_original', $fieldNode)) == FALSE) || (($idNode = $idNodes -> item(0)) == NULL))
				throw new Exception('error parsing statistics');
			if ((($nameNodes = $xpath -> query('./field[@name = "value"]/@value', $fieldNode)) == FALSE) || (($nameNode = $nameNodes -> item(0)) == NULL))
				throw new Exception('error parsing statistics');
			if ((($countNodes = $xpath -> query('./field[@name = "count"]/@value', $fieldNode)) == FALSE) || (($countNode = $countNodes -> item(0)) == NULL))
				throw new Exception('error parsing statistics');
			$statistic = new JObject();
			$statistic -> id = trim($idNode -> nodeValue);
			$statistic -> name = trim($nameNode -> nodeValue);
			$statistic -> count = intval(trim($countNode -> nodeValue));
			$statistics[$statistic -> id] = $statistic;
		}
		return $statistics;
	}
	
	// Parse total results from a search service XML response.
	// xpath the DOMXPath to parse
	// return total results (integer)
	private function parseTotalResults($xpath) {
		if ((($totalNodes = $xpath -> query('/response/header/total')) == FALSE) || (($totalNode = $totalNodes -> item(0)) == NULL))
			throw new Exception('error parsing total results');
		return intval(trim($totalNode -> nodeValue));
	}
	// Parse publications from a search service XML response.
	// xpath the DOMXPath to parse
	// return results (array)
	private function parseResults($xpath) {
		if (($resultNodes = $xpath -> query('/response/results/result')) == FALSE)
			throw new Exception('error parsing results');
		$publications = array();		
		foreach ($resultNodes as $resultNode) {		
			if (($idNodes = $xpath -> query('./field[@name = "resultId"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing results');
			if (($datasourceNodes = $xpath -> query('./field[@name = "datasource"]', $resultNode)) == FALSE)
				throw new Exception('error parsing publications');		
			if (($titleNodes = $xpath -> query('./field[@name = "title"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing results');
                        if (($subjectNodes = $xpath -> query('./field[@name = "subject"]', $resultNode)) == FALSE)
				throw new Exception('error parsing results');
                        if (($relatedNodes = $xpath -> query('./field[@name = "related"]', $resultNode)) == FALSE)
				throw new Exception('error parsing results');
			if (($authorNodes = $xpath -> query('./field[@name = "author"]', $resultNode)) == FALSE)
				throw new Exception('error parsing results');
			if (($publisherNodes = $xpath -> query('./field[@name = "publisher"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing results');
			if (($yearNodes = $xpath -> query('./field[@name = "dateofacceptance"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing results');	
			if (($languageNodes = $xpath -> query('./field[@name = "language"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing results');
			if (($projectNodes = $xpath -> query('./field[@name = "project"]', $resultNode)) == FALSE)
				throw new Exception('error parsing results');
			if (($embargoEndDateNodes = $xpath -> query('./field[@name = "embargoenddate"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing results');
			if (($descriptionNodes = $xpath -> query('./field[@name = "description"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing results');
			$publication = new JObject();
			$publication -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$publication -> source = 'openaire';
			$publication -> url = NULL;
			$publication -> accessMode = NULL;
			$publication -> datasources = array();
			$publication -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
			$publication -> authors = array();
			$publication -> publisher = (($publisherNode = $publisherNodes -> item(0)) == NULL) ? NULL : trim($publisherNode -> nodeValue);
			$publication -> year = (($yearNode = $yearNodes -> item(0)) == NULL) ? NULL : intval(trim($yearNode -> nodeValue));
			$publication -> language = (($languageNode = $languageNodes -> item(0)) == NULL) ? NULL : trim($languageNode -> nodeValue);
			$publication -> projects = array();
                        $publication -> subjects = array();
                        $publication -> related = array();
			$publication -> embargoEndDate = (($embargoEndDateNode = $embargoEndDateNodes -> item(0)) == NULL) ? NULL : strtotime(trim($embargoEndDateNode -> nodeValue));
			$publication -> description = (($descriptionNode = $descriptionNodes -> item(0)) == NULL) ? NULL : trim($descriptionNode -> nodeValue);
			foreach ($subjectNodes as $subjectNode) {
				if (($titleNodes = $xpath -> query('./@value', $subjectNode)) == FALSE)
					throw new Exception('error parsing results');
                if (($inferredNodes = $xpath -> query('./field[@name = "inferred"]/@value', $subjectNode)) == FALSE)
					throw new Exception('error parsing results');
				if (($trustNodes = $xpath -> query('./field[@name = "trust"]/@value', $subjectNode)) == FALSE)
					throw new Exception('error parsing results');
				if (($provenanceNodes = $xpath -> query('./field[@name = "provenance"]/@value', $subjectNode)) == FALSE)
					throw new Exception('error parsing results');
				$subject = new JObject();
                $subject -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
                $subject -> inferred = (($inferredNode = $inferredNodes -> item(0)) == NULL) ? NULL : trim($inferredNode -> nodeValue)=="true"?true:false;
				$subject -> trust = (($trustNode = $trustNodes -> item(0)) == NULL) ? NULL : trim($trustNode -> nodeValue);
				$subject -> provenance = (($provenanceNode = $provenanceNodes -> item(0)) == NULL) ? NULL : trim($provenanceNode -> nodeValue);
               	if (($subject -> title != NULL) || ($subject -> inferred != NULL) || ($subject -> trust != NULL) || ($subject -> provenance != NULL))
					$publication -> subjects[] = $subject;
				}
                        
                        foreach ($relatedNodes as $relatedNode) {
				
				if (($titleNodes = $xpath -> query('./field[@name= "title"]/@value', $relatedNode)) == FALSE)
					throw new Exception('error parsing results');
                                if (($inferredNodes = $xpath -> query('./field[@name = "inferred"]/@value', $relatedNode)) == FALSE)
					throw new Exception('error parsing results');
				if (($trustNodes = $xpath -> query('./field[@name = "trust"]/@value', $relatedNode)) == FALSE)
					throw new Exception('error parsing results');
				if (($provenanceNodes = $xpath -> query('./field[@name = "provenance"]/@value', $relatedNode)) == FALSE)
					throw new Exception('error parsing results');
				$related = new JObject();
                $related -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
                $related -> inferred = (($inferredNode = $inferredNodes -> item(0)) == NULL) ? NULL : trim($inferredNode -> nodeValue)=="true"?true:false;
				$related -> trust = (($trustNode = $trustNodes -> item(0)) == NULL) ? NULL : trim($trustNode -> nodeValue);
				$related -> provenance = (($provenanceNode = $provenanceNodes -> item(0)) == NULL) ? NULL : trim($provenanceNode -> nodeValue);
                if (($related -> title != NULL) || ($related -> inferred != NULL) || ($related -> trust != NULL) || ($related -> provenance != NULL))
					$publication -> related[] = $related;
			}
                        
            foreach ($datasourceNodes as $datasourceNode) {
				if (($urlNodes = $xpath -> query('./field[@name = "url"]/@value', $datasourceNode)) == FALSE)
					throw new Exception('error parsing results');
				if (($accessModeNodes = $xpath -> query('./field[@name = "licenceid"]/@value_original', $datasourceNode)) == FALSE)
					throw new Exception('error parsing results');
				$datasource = new JObject();
				$datasource -> url = (($urlNode = $urlNodes -> item(0)) == NULL) ? NULL : trim($urlNode -> nodeValue);
				$datasource -> accessMode = (($accessModeNode = $accessModeNodes -> item(0)) == NULL) ? NULL : trim($accessModeNode -> nodeValue);
				if (($datasource -> url != NULL) && ((($datasource -> accessMode == self :: DATASOURCE_ACCESS_OPEN) && (($publication -> accessMode == NULL) || ($publication -> accessMode == self :: UNKNOWN) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_EMBARGO))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_EMBARGO) &&  (($publication -> accessMode == NULL) || ($publication -> accessMode == self :: UNKNOWN) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED) && (($publication -> accessMode == NULL) || ($publication -> accessMode == self :: UNKNOWN) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_CLOSED))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) && (($publication -> accessMode == NULL) || ($publication -> accessMode == self :: UNKNOWN))) || (($datasource -> accessMode == self :: UNKNOWN) && ($publication -> accessMode == NULL)) || ((($datasource -> accessMode == NULL) && ($publication -> accessMode == NULL) && ($publication -> url == NULL))))) {
					$publication -> accessMode = $datasource -> accessMode;
					$publication -> url = $datasource -> url;
				}
				if (($datasource -> url != NULL) || ($datasource -> accessMode != NULL))
					$publication -> datasources[] = $datasource;
			}
			foreach ($authorNodes as $authorNode) {
				if (($idNodes = $xpath -> query('./field[@name = "personId"]/@value', $authorNode)) == FALSE)
					throw new Exception('error parsing results');
				if (($fullNameNodes = $xpath -> query('./field[@name = "fullname"]/@value', $authorNode)) == FALSE)
					throw new Exception('error parsing results');
				if (($rankingNodes = $xpath -> query('./field[@name = "ranking"]/@value', $authorNode)) == FALSE)
					throw new Exception('error parsing results');
				$author = new JObject();
				$author -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$author -> lastName = NULL;
				$author -> firstName = NULL;
				$author -> fullName = (($fullNameNode = $fullNameNodes -> item(0)) == NULL) ? NULL : trim($fullNameNode -> nodeValue);
				$author -> ranking = (($rankingNode = $rankingNodes -> item(0)) == NULL) ? 0 : intval(trim($rankingNode -> nodeValue));
				if (($author -> id != NULL) || ($author -> lastName != NULL) || ($author -> firstName != NULL) || ($author -> fullName != NULL))
					$publication -> authors[] = $author;
				usort($publication -> authors, function ($author1, $author2) {return $author1 -> ranking - $author2 -> ranking;});
			}		
			foreach ($projectNodes as $projectNode) {
				if (($idNodes = $xpath -> query('./field[@name = "projectId"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing results');
				if (($acronymNodes = $xpath -> query('./field[@name = "projectacronym"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing results');
				if (($titleNodes = $xpath -> query('./field[@name = "projecttitle"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing results');
				if (($codeNodes = $xpath -> query('./field[@name = "projectcode"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing results');
				$project = new JObject();
				$project -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$project -> acronym = (($acronymNode = $acronymNodes -> item(0)) == NULL) ? NULL : ((trim($acronymNode -> nodeValue) == self :: UNKNOWN) ? NULL : trim($acronymNode -> nodeValue));
				$project -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
				$project -> code = (($codeNode = $codeNodes -> item(0)) == NULL) ? NULL : trim($codeNode -> nodeValue);
				if (($project -> id != NULL) || ($project -> acronym != NULL) || ($project -> title != NULL) || ($project -> code != NULL))
					$publication -> projects[] = $project;
			}
			if (($publication -> id != NULL) || ($publication -> source != NULL) || ($publication -> url != NULL) || ($publication -> accessMode != NULL) || ($publication -> datasources != NULL) || ($publication -> title != NULL) || ($publication -> authors != NULL) || ($publication -> publisher != NULL) || ($publication -> year != NULL) || ($publication -> language != NULL) || ($publication -> projects != NULL) || ($publication -> embargoEndDate != NULL) || ($publication -> description != NULL))
				$publications[] = $publication;
		}
		return $publications;
	}
	// Parse publications from a search service XML response.
	// xpath the DOMXPath to parse
	// return publications (array)
	private function parsePublications($xpath) {
		if (($resultNodes = $xpath -> query('/response/results/result')) == FALSE)
			throw new Exception('error parsing publications');
		$publications = array();		
		foreach ($resultNodes as $resultNode) {		
			if (($idNodes = $xpath -> query('./field[@name = "resultId"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing publications');
			if (($datasourceNodes = $xpath -> query('./field[@name = "datasource"]', $resultNode)) == FALSE)
				throw new Exception('error parsing publications');		
			if (($titleNodes = $xpath -> query('./field[@name = "title"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing publications');
            if (($subjectNodes = $xpath -> query('./field[@name = "subject"]', $resultNode)) == FALSE)
				throw new Exception('error parsing publications');
           	if (($relatedNodes = $xpath -> query('./field[@name = "related"]', $resultNode)) == FALSE)
				throw new Exception('error parsing publications');
			if (($authorNodes = $xpath -> query('./field[@name = "author"]', $resultNode)) == FALSE)
				throw new Exception('error parsing publications');
			if (($publisherNodes = $xpath -> query('./field[@name = "publisher"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing publications');
			if (($yearNodes = $xpath -> query('./field[@name = "dateofacceptance"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing publications');	
			if (($languageNodes = $xpath -> query('./field[@name = "language"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing publications');
			if (($projectNodes = $xpath -> query('./field[@name = "project"]', $resultNode)) == FALSE)
				throw new Exception('error parsing publications');
			if (($embargoEndDateNodes = $xpath -> query('./field[@name = "embargoenddate"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing publications');
			if (($descriptionNodes = $xpath -> query('./field[@name = "description"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing publications');
			$publication = new JObject();
			$publication -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$publication -> source = 'openaire';
			$publication -> url = NULL;
			$publication -> accessMode = NULL;
			$publication -> datasources = array();
			$publication -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
			$publication -> authors = array();
			$publication -> publisher = (($publisherNode = $publisherNodes -> item(0)) == NULL) ? NULL : trim($publisherNode -> nodeValue);
			$publication -> year = (($yearNode = $yearNodes -> item(0)) == NULL) ? NULL : intval(trim($yearNode -> nodeValue));
			$publication -> language = (($languageNode = $languageNodes -> item(0)) == NULL) ? NULL : trim($languageNode -> nodeValue);
			$publication -> projects = array();
            $publication -> subjects = array();
            $publication -> related = array();
			$publication -> embargoEndDate = (($embargoEndDateNode = $embargoEndDateNodes -> item(0)) == NULL) ? NULL : strtotime(trim($embargoEndDateNode -> nodeValue));
			$publication -> description = (($descriptionNode = $descriptionNodes -> item(0)) == NULL) ? NULL : trim($descriptionNode -> nodeValue);
			foreach ($subjectNodes as $subjectNode) {
				if (($titleNodes = $xpath -> query('./@value', $subjectNode)) == FALSE)
					throw new Exception('error parsing publications');
                if (($inferredNodes = $xpath -> query('./field[@name = "inferred"]/@value', $subjectNode)) == FALSE)
					throw new Exception('error parsing publications');
				if (($trustNodes = $xpath -> query('./field[@name = "trust"]/@value', $subjectNode)) == FALSE)
					throw new Exception('error parsing publications');
				if (($provenanceNodes = $xpath -> query('./field[@name = "provenance"]/@value', $subjectNode)) == FALSE)
					throw new Exception('error parsing publications');
				$subject = new JObject();
                $subject -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
                $subject -> inferred = (($inferredNode = $inferredNodes -> item(0)) == NULL) ? NULL : trim($inferredNode -> nodeValue)=="true"?true:false;
				$subject -> trust = (($trustNode = $trustNodes -> item(0)) == NULL) ? NULL : trim($trustNode -> nodeValue);
				$subject -> provenance = (($provenanceNode = $provenanceNodes -> item(0)) == NULL) ? NULL : trim($provenanceNode -> nodeValue);
               	if (($subject -> title != NULL) || ($subject -> inferred != NULL) || ($subject -> trust != NULL) || ($subject -> provenance != NULL))
					$publication -> subjects[] = $subject;
				}
                        
                        foreach ($relatedNodes as $relatedNode) {
				
				if (($titleNodes = $xpath -> query('./field[@name= "title"]/@value', $relatedNode)) == FALSE)
					throw new Exception('error parsing publications');
                                if (($inferredNodes = $xpath -> query('./field[@name = "inferred"]/@value', $relatedNode)) == FALSE)
					throw new Exception('error parsing publications');
				if (($trustNodes = $xpath -> query('./field[@name = "trust"]/@value', $relatedNode)) == FALSE)
					throw new Exception('error parsing publications');
				if (($provenanceNodes = $xpath -> query('./field[@name = "provenance"]/@value', $relatedNode)) == FALSE)
					throw new Exception('error parsing publications');
				$related = new JObject();
                $related -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
                $related -> inferred = (($inferredNode = $inferredNodes -> item(0)) == NULL) ? NULL : trim($inferredNode -> nodeValue)=="true"?true:false;
				$related -> trust = (($trustNode = $trustNodes -> item(0)) == NULL) ? NULL : trim($trustNode -> nodeValue);
				$related -> provenance = (($provenanceNode = $provenanceNodes -> item(0)) == NULL) ? NULL : trim($provenanceNode -> nodeValue);
                if (($related -> title != NULL) || ($related -> inferred != NULL) || ($related -> trust != NULL) || ($related -> provenance != NULL))
					$publication -> related[] = $related;
			}
                        
            foreach ($datasourceNodes as $datasourceNode) {
				if (($urlNodes = $xpath -> query('./field[@name = "url"]/@value', $datasourceNode)) == FALSE)
					throw new Exception('error parsing publications');
				if (($accessModeNodes = $xpath -> query('./field[@name = "licenceid"]/@value_original', $datasourceNode)) == FALSE)
					throw new Exception('error parsing publications');
				$datasource = new JObject();
				$datasource -> url = (($urlNode = $urlNodes -> item(0)) == NULL) ? NULL : trim($urlNode -> nodeValue);
				$datasource -> accessMode = (($accessModeNode = $accessModeNodes -> item(0)) == NULL) ? NULL : trim($accessModeNode -> nodeValue);
				if (($datasource -> url != NULL) && ((($datasource -> accessMode == self :: DATASOURCE_ACCESS_OPEN) && (($publication -> accessMode == NULL) || ($publication -> accessMode == self :: UNKNOWN) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_EMBARGO))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_EMBARGO) &&  (($publication -> accessMode == NULL) || ($publication -> accessMode == self :: UNKNOWN) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED) && (($publication -> accessMode == NULL) || ($publication -> accessMode == self :: UNKNOWN) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_CLOSED))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) && (($publication -> accessMode == NULL) || ($publication -> accessMode == self :: UNKNOWN))) || (($datasource -> accessMode == self :: UNKNOWN) && ($publication -> accessMode == NULL)) || ((($datasource -> accessMode == NULL) && ($publication -> accessMode == NULL) && ($publication -> url == NULL))))) {
					$publication -> accessMode = $datasource -> accessMode;
					$publication -> url = $datasource -> url;
				}
				if (($datasource -> url != NULL) || ($datasource -> accessMode != NULL))
					$publication -> datasources[] = $datasource;
			}
			foreach ($authorNodes as $authorNode) {
				if (($idNodes = $xpath -> query('./field[@name = "personId"]/@value', $authorNode)) == FALSE)
					throw new Exception('error parsing publications');
				if (($fullNameNodes = $xpath -> query('./field[@name = "fullname"]/@value', $authorNode)) == FALSE)
					throw new Exception('error parsing publications');
				if (($rankingNodes = $xpath -> query('./field[@name = "ranking"]/@value', $authorNode)) == FALSE)
					throw new Exception('error parsing publications');
				$author = new JObject();
				$author -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$author -> lastName = NULL;
				$author -> firstName = NULL;
				$author -> fullName = (($fullNameNode = $fullNameNodes -> item(0)) == NULL) ? NULL : trim($fullNameNode -> nodeValue);
				$author -> ranking = (($rankingNode = $rankingNodes -> item(0)) == NULL) ? 0 : intval(trim($rankingNode -> nodeValue));
				if (($author -> id != NULL) || ($author -> lastName != NULL) || ($author -> firstName != NULL) || ($author -> fullName != NULL))
					$publication -> authors[] = $author;
				usort($publication -> authors, function ($author1, $author2) {return $author1 -> ranking - $author2 -> ranking;});
			}		
			foreach ($projectNodes as $projectNode) {
				if (($idNodes = $xpath -> query('./field[@name = "projectId"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing publications');
				if (($acronymNodes = $xpath -> query('./field[@name = "projectacronym"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing publications');
				if (($titleNodes = $xpath -> query('./field[@name = "projecttitle"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing publications');
				if (($codeNodes = $xpath -> query('./field[@name = "projectcode"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing publications');
				$project = new JObject();
				$project -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$project -> acronym = (($acronymNode = $acronymNodes -> item(0)) == NULL) ? NULL : ((trim($acronymNode -> nodeValue) == self :: UNKNOWN) ? NULL : trim($acronymNode -> nodeValue));
				$project -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
				$project -> code = (($codeNode = $codeNodes -> item(0)) == NULL) ? NULL : trim($codeNode -> nodeValue);
				if (($project -> id != NULL) || ($project -> acronym != NULL) || ($project -> title != NULL) || ($project -> code != NULL))
					$publication -> projects[] = $project;
			}
			if (($publication -> id != NULL) || ($publication -> source != NULL) || ($publication -> url != NULL) || ($publication -> accessMode != NULL) || ($publication -> datasources != NULL) || ($publication -> title != NULL) || ($publication -> authors != NULL) || ($publication -> publisher != NULL) || ($publication -> year != NULL) || ($publication -> language != NULL) || ($publication -> projects != NULL) || ($publication -> embargoEndDate != NULL) || ($publication -> description != NULL))
				$publications[] = $publication;
		}
		return $publications;
	}
	
	// Parse datasets from a search service XML response.
	// xpath the DOMXPath to parse
	// return datasets (array)
	private function parseDatasets($xpath) {
		if (($resultNodes = $xpath -> query('/response/results/result')) == FALSE)
			throw new Exception('error parsing datasets');
		$datasets = array();		
		foreach ($resultNodes as $resultNode) {		
			if (($idNodes = $xpath -> query('./field[@name = "resultId"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasets');
			if (($datasourceNodes = $xpath -> query('./field[@name = "datasource"]', $resultNode)) == FALSE)
				throw new Exception('error parsing datasets');		
			if (($titleNodes = $xpath -> query('./field[@name = "title"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasets');
			if (($authorNodes = $xpath -> query('./field[@name = "author"]', $resultNode)) == FALSE)
				throw new Exception('error parsing datasets');
			if (($publisherNodes = $xpath -> query('./field[@name = "publisher"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasets');
			if (($yearNodes = $xpath -> query('./field[@name = "dateofacceptance"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasets');
			if (($languageNodes = $xpath -> query('./field[@name = "language"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasets');
			if (($projectNodes = $xpath -> query('./field[@name = "project"]', $resultNode)) == FALSE)
				throw new Exception('error parsing datasets');
			if (($embargoEndDateNodes = $xpath -> query('./field[@name = "embargoenddate"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasets');
			if (($descriptionNodes = $xpath -> query('./field[@name = "description"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasets');
			$dataset = new JObject();
			$dataset -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$dataset -> source = 'openaire';
			$dataset -> url = NULL;
			$dataset -> accessMode = NULL;
			$dataset -> datasources = array();
			$dataset -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
			$dataset -> authors = array();
			$dataset -> publisher = (($publisherNode = $publisherNodes -> item(0)) == NULL) ? NULL : trim($publisherNode -> nodeValue);
			$dataset -> year = (($yearNode = $yearNodes -> item(0)) == NULL) ? NULL : intval(trim($yearNode -> nodeValue));
			$dataset -> language = (($languageNode = $languageNodes -> item(0)) == NULL) ? NULL : trim($languageNode -> nodeValue);
			$dataset -> projects = array();
			$dataset -> embargoEndDate = (($embargoEndDateNode = $embargoEndDateNodes -> item(0)) == NULL) ? NULL : strtotime(trim($embargoEndDateNode -> nodeValue));
			$dataset -> description = (($descriptionNode = $descriptionNodes -> item(0)) == NULL) ? NULL : trim($descriptionNode -> nodeValue);
			foreach ($datasourceNodes as $datasourceNode) {
				if (($urlNodes = $xpath -> query('./field[@name = "url"]/@value', $datasourceNode)) == FALSE)
					throw new Exception('error parsing datasets');
				if (($accessModeNodes = $xpath -> query('./field[@name = "licenceid"]/@value_original', $datasourceNode)) == FALSE)
					throw new Exception('error parsing datasets');
				$datasource = new JObject();
				$datasource -> url = (($urlNode = $urlNodes -> item(0)) == NULL) ? NULL : trim($urlNode -> nodeValue);
				$datasource -> accessMode = (($accessModeNode = $accessModeNodes -> item(0)) == NULL) ? NULL : trim($accessModeNode -> nodeValue);
				if (($datasource -> url != NULL) && ((($datasource -> accessMode == self :: DATASOURCE_ACCESS_OPEN) && (($dataset -> accessMode == NULL) || ($dataset -> accessMode == self :: UNKNOWN) || ($dataset -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) || ($dataset -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED) || ($dataset -> accessMode == self :: DATASOURCE_ACCESS_EMBARGO))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_EMBARGO) &&  (($dataset -> accessMode == NULL) || ($dataset -> accessMode == self :: UNKNOWN) || ($dataset -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) || ($dataset -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED) && (($dataset -> accessMode == NULL) || ($dataset -> accessMode == self :: UNKNOWN) || ($dataset -> accessMode == self :: DATASOURCE_ACCESS_CLOSED))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) && (($dataset -> accessMode == NULL) || ($dataset -> accessMode == self :: UNKNOWN))) || (($datasource -> accessMode == self :: UNKNOWN) && ($dataset -> accessMode == NULL)) || ((($datasource -> accessMode == NULL) && ($dataset -> accessMode == NULL) && ($dataset -> url == NULL))))) {
					$dataset -> accessMode = $datasource -> accessMode;
					$dataset -> url = $datasource -> url;
				}
				if (($datasource -> url != NULL) || ($datasource -> accessMode != NULL))
					$dataset -> datasources[] = $datasource;
			}
			foreach ($authorNodes as $authorNode) {
				if (($idNodes = $xpath -> query('./field[@name = "personId"]/@value', $authorNode)) == FALSE)
					throw new Exception('error parsing datasets');
				if (($fullNameNodes = $xpath -> query('./field[@name = "fullname"]/@value', $authorNode)) == FALSE)
					throw new Exception('error parsing datasets');
				if (($rankingNodes = $xpath -> query('./field[@name = "ranking"]/@value', $authorNode)) == FALSE)
					throw new Exception('error parsing datasets');
				$author = new JObject();
				$author -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$author -> lastName = NULL;
				$author -> firstName = NULL;
				$author -> fullName = (($fullNameNode = $fullNameNodes -> item(0)) == NULL) ? NULL : trim($fullNameNode -> nodeValue);
				$author -> ranking = (($rankingNode = $rankingNodes -> item(0)) == NULL) ? 0 : intval(trim($rankingNode -> nodeValue));
				if (($author -> id != NULL) || ($author -> lastName != NULL) || ($author -> firstName != NULL) || ($author -> fullName != NULL))
					$dataset -> authors[] = $author;
				usort($dataset -> authors, function ($author1, $author2) {return $author1 -> ranking - $author2 -> ranking;});
			}		
			foreach ($projectNodes as $projectNode) {
				if (($idNodes = $xpath -> query('./field[@name = "projectId"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing datasets');
				if (($acronymNodes = $xpath -> query('./field[@name = "projectacronym"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing datasets');
				if (($titleNodes = $xpath -> query('./field[@name = "projecttitle"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing datasets');
				if (($codeNodes = $xpath -> query('./field[@name = "projectcode"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing datasets');
				$project = new JObject();
				$project -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$project -> acronym = (($acronymNode = $acronymNodes -> item(0)) == NULL) ? NULL : ((trim($acronymNode -> nodeValue) == self :: UNKNOWN) ? NULL : trim($acronymNode -> nodeValue));
				$project -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
				$project -> code = (($codeNode = $codeNodes -> item(0)) == NULL) ? NULL : trim($codeNode -> nodeValue);
				if (($project -> id != NULL) || ($project -> acronym != NULL) || ($project -> title != NULL) || ($project -> code != NULL))
					$dataset -> projects[] = $project;
			}
			if (($dataset -> id != NULL) || ($dataset -> source != NULL) || ($dataset -> url != NULL) || ($dataset -> accessMode != NULL) || ($dataset -> datasources != NULL) || ($dataset -> title != NULL) || ($dataset -> authors != NULL) || ($dataset -> publisher != NULL) || ($dataset -> year != NULL) || ($dataset -> language != NULL) || ($dataset -> projects != NULL) || ($dataset -> embargoEndDate != NULL) || ($dataset -> description != NULL))
				$datasets[] = $dataset;
		}
		return $datasets;
	}
	
	// Parse projects from a search service XML response.
	// xpath the DOMXPath to parse
	// return projects (array)
	private function parseProjects($xpath) {
		if (($resultNodes = $xpath -> query('/response/results/result')) == FALSE)
			throw new Exception('error parsing projects');
		$projects = array();		
		foreach ($resultNodes as $resultNode) {		
			if (($idNodes = $xpath -> query('./field[@name = "projectId"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing projects');
			if (($acronymNodes = $xpath -> query('./field[@name = "name"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing projects');
			if (($titleNodes = $xpath -> query('./field[@name = "title"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing projects');
			if (($codeNodes = $xpath -> query('./field[@name = "code"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing projects');
			if (($sc39Nodes = $xpath -> query('./field[@name = "ec_sc39"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing projects');
			if (($funderNodes = $xpath -> query('./field[@name = "funding_level_0"]/field[@name = "fundingname"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing projects');
			if (($startYearNodes = $xpath -> query('./field[@name = "startyear"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing projects');
			if (($endYearNodes = $xpath -> query('./field[@name = "endyear"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing projects');
			if (($organizationNodes = $xpath -> query('./field[@name = "organization"]', $resultNode)) == FALSE)
				throw new Exception('error parsing projects');
			$project = new JObject();
			$project -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$project -> acronym = ((($acronymNode = $acronymNodes -> item(0)) == NULL) || (trim($acronymNode -> nodeValue) == self :: UNKNOWN)) ? NULL : trim($acronymNode -> nodeValue);
			$project -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
			$project -> code = (($codeNode = $codeNodes -> item(0)) == NULL) ? NULL : trim($codeNode -> nodeValue);
			$project -> sc39 = (($sc39Node = $sc39Nodes -> item(0)) == NULL) ? NULL : trim($sc39Node -> nodeValue);
			switch ($project -> sc39) {
			case 'true':
				$project -> sc39 = TRUE;
				break;
			case 'false':
				$project -> sc39 = FALSE;
				break;
			default:
				$project -> sc39 = NULL;
			}
			$project -> funder = (($funderNode = $funderNodes -> item(0)) == NULL) ? NULL : trim($funderNode -> nodeValue);
			$project -> startYear = (($startYearNode = $startYearNodes -> item(0)) == NULL) ? NULL : intval(trim($startYearNode -> nodeValue));
			$project -> endYear = (($endYearNode = $endYearNodes -> item(0)) == NULL) ? NULL : intval(trim($endYearNode -> nodeValue));
			$project -> organizations = array();			
			foreach ($organizationNodes as $organizationNode) {
				if (($idNodes = $xpath -> query('./field[@name = "organizationid"]/@value', $organizationNode)) == FALSE)
					throw new Exception('error parsing projects');
				if (($shortNameNodes = $xpath -> query('./field[@name = "legalshortname"]/@value', $organizationNode)) == FALSE)
					throw new Exception('error parsing projects');
				if (($nameNodes = $xpath -> query('./field[@name = "legalname"]/@value', $organizationNode)) == FALSE)
					throw new Exception('error parsing projects');
				$organization = new JObject();
				$organization -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$organization -> shortName = (($shortNameNode = $shortNameNodes -> item(0)) == NULL) ? NULL : trim($shortNameNode -> nodeValue);
				$organization -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
				if (($organization -> id != NULL) || ($organization -> shortName != NULL) || ($organization -> name != NULL))
					$project -> organizations[] = $organization;
			}
			if (($project -> id != NULL) || ($project -> acronym != NULL) || ($project -> title != NULL) || ($project -> code != NULL) || ($project -> sc39 != NULL) || ($project -> funder != NULL) || ($project -> startYear != NULL) || ($project -> endYear != NULL) || ($project -> organizations != NULL))
				$projects[] = $project;
		}
		return $projects;
	}

	// Parse people from a search service XML response.
	// xpath the DOMXPath to parse
	// return people (array)
	private function parsePeople($xpath) {
		if (($resultNodes = $xpath -> query('/response/results/record')) == FALSE)
			throw new Exception('error parsing people');
		$people = array();		
		foreach ($resultNodes as $resultNode) {
			if (($idNodes = $xpath -> query('./field[@name = "personId"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing people');
			if (($lastNameNodes = $xpath -> query('./field[@name = "secondnames"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing people');
			if (($firstNameNodes = $xpath -> query('./field[@name = "firstname"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing people');
			if (($fullNameNodes = $xpath -> query('./field[@name = "fullname"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing people');
			if (($countryNodes = $xpath -> query('./field[@name = "nationalityid"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing people');
			$person = new JObject();
			$person -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$person -> lastName = (($lastNameNode = $lastNameNodes -> item(0)) == NULL) ? NULL : trim($lastNameNode -> nodeValue);
			$person -> firstName = (($firstNameNode = $firstNameNodes -> item(0)) == NULL) ? NULL : trim($firstNameNode -> nodeValue);
			$person -> fullName = (($fullNameNode = $fullNameNodes -> item(0)) == NULL) ? NULL : trim($fullNameNode -> nodeValue);
			$person -> country = (($countryNode = $countryNodes -> item(0)) == NULL) ? NULL : trim($countryNode -> nodeValue);
			if (($person -> id != NULL) || ($person -> lastName != NULL) || ($person -> firstName != NULL) || ($person -> fullName != NULL) || ($person -> country != NULL))
				$people[] = $person;
		}
		return $people;
	}

	// Parse organizations from a search service XML response.
	// xpath the DOMXPath to parse
	// return organizations (array)
	private function parseOrganizations($xpath) {
		if (($resultNodes = $xpath -> query('/response/results/result')) == FALSE)
			throw new Exception('error parsing organizations');
		$organizations = array();		
		foreach ($resultNodes as $resultNode) {
			if (($idNodes = $xpath -> query('./field[@name = "organizationId"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing organizations');
			if (($shortNameNodes = $xpath -> query('./field[@name = "legalshortname"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing organizations');
			if (($nameNodes = $xpath -> query('./field[@name = "legalname"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing organizations');
			if (($countryNodes = $xpath -> query('./field[@name = "countryname"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing organizations');
			if (($projectNodes = $xpath -> query('./field[@name = "project"]', $resultNode)) == FALSE)
				throw new Exception('error parsing organizations');
			$organization = new JObject();
			$organization -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$organization -> shortName = (($shortNameNode = $shortNameNodes -> item(0)) == NULL) ? NULL : trim($shortNameNode -> nodeValue);
			$organization -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
			$organization -> country = (($countryNode = $countryNodes -> item(0)) == NULL) ? NULL : trim($countryNode -> nodeValue);
			$organization -> projects = array();
			foreach ($projectNodes as $projectNode) {
				if (($idNodes = $xpath -> query('./field[@name = "projectId"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing organizations');
				if (($acronymNodes = $xpath -> query('./field[@name = "projectacronym"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing organizations');
				if (($titleNodes = $xpath -> query('./field[@name = "projecttitle"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing organizations');
				if (($codeNodes = $xpath -> query('./field[@name = "projectcode"]/@value', $projectNode)) == FALSE)
					throw new Exception('error parsing organizations');
				$project = new JObject();
				$project -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$project -> acronym = (($acronymNode = $acronymNodes -> item(0)) == NULL) ? NULL : ((trim($acronymNode -> nodeValue) == self :: UNKNOWN) ? NULL : trim($acronymNode -> nodeValue));
				$project -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
				$project -> code = (($codeNode = $codeNodes -> item(0)) == NULL) ? NULL : trim($codeNode -> nodeValue);
				if (($project -> id != NULL) || ($project -> acronym != NULL) || ($project -> title != NULL) || ($project -> code != NULL))
					$organization -> projects[] = $project;
			}
			if (($organization -> id != NULL) || ($organization -> shortName != NULL) || ($organization -> name != NULL) || ($organization -> country != NULL) || ($organization -> projects != NULL))
				$organizations[] = $organization;
		}
		return $organizations;
	}
	
	// Parse datasources from a search service XML response.
	// xpath the DOMXPath to parse
	// return datasources (array)
	private function parseDatasources($xpath) {
		if (($resultNodes = $xpath -> query('/response/results/result')) == FALSE)
			throw new Exception('error parsing datasources');
		$datasources = array();		
		foreach ($resultNodes as $resultNode) {	
			if (($idNodes = $xpath -> query('./field[@name = "datasourceId"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			if (($typeNodes = $xpath -> query('./field[@name = "datasourcetypeuiid"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			if (($typeIdNodes = $xpath -> query('./field[@name = "datasourcetypeuiid"]/@value_original', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			if (($compatibilityNodes = $xpath -> query('./field[@name = "openairecompatibilityid"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			if (($urlNodes = $xpath -> query('./field[@name = "websiteurl"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			if (($nameNodes = $xpath -> query('./field[@name = "officialname"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			if (($englishNameNodes = $xpath -> query('./field[@name = "englishname"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			if (($itemsNodes = $xpath -> query('./field[@name = "odnumberofitems"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			if (($dateNodes = $xpath -> query('./field[@name = "odnumberofitemsdate"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			if (($languageNodes = $xpath -> query('./field[@name = "odlanguages"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			if (($policyNodes = $xpath -> query('./field[@name = "odpolicies"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			if (($contentNodes = $xpath -> query('./field[@name = "odcontenttypes"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			if (($oaiPmhNodes = $xpath -> query('./field[@name = "accessinfopackage"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			if (($descriptionNodes = $xpath -> query('./field[@name = "oddescription"]/@value', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			if (($organizationNodes = $xpath -> query('./field[@name = "organization"]', $resultNode)) == FALSE)
				throw new Exception('error parsing datasources');
			$datasource = new JObject();
			$datasource -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$datasource -> type = (($typeNode = $typeNodes -> item(0)) == NULL) ? NULL : trim($typeNode -> nodeValue);
			$datasource -> typeId = (($typeIdNode = $typeIdNodes -> item(0)) == NULL) ? NULL : trim($typeIdNode -> nodeValue);
			$datasource -> compatibility = (($compatibilityNode = $compatibilityNodes -> item(0)) == NULL) ? NULL : trim($compatibilityNode -> nodeValue);
			$datasource -> url = (($urlNode = $urlNodes -> item(0)) == NULL) ? NULL : trim($urlNode -> nodeValue);
			$datasource -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
			$datasource -> englishName = (($englishNameNode = $englishNameNodes -> item(0)) == NULL) ? NULL : trim($englishNameNode -> nodeValue);
			$datasource -> items = (($itemsNode = $itemsNodes -> item(0)) == NULL) ? NULL : intval(trim($itemsNode -> nodeValue));
			$datasource -> date = (($dateNode = $dateNodes -> item(0)) == NULL) ? NULL : strtotime(trim($dateNode -> nodeValue));
			$datasource -> languages = array();
			$datasource -> policies = array();
			$datasource -> contents = array();
			$datasource -> oaiPmhUrls = array();
			$datasource -> description = (($descriptionNode = $descriptionNodes -> item(0)) == NULL) ? NULL : trim($descriptionNode -> nodeValue);
			$datasource -> organizations = array();
			foreach ($languageNodes as $languageNode) {
				if (trim($languageNode -> nodeValue) != NULL)
					$datasource -> languages[] = trim($languageNode -> nodeValue);
			}
			foreach ($policyNodes as $policyNode) {
				if (trim($policyNode -> nodeValue) != NULL)
					$datasource -> policies[] = trim($policyNode -> nodeValue);
			}
			foreach ($contentNodes as $contentNode) {
				if (trim($contentNode -> nodeValue) != NULL)
					$datasource -> contents[] = trim($contentNode -> nodeValue);
			}
			foreach ($oaiPmhNodes as $oaiPmhNode) {
				if (trim($oaiPmhNode -> nodeValue) != NULL)
					$datasource -> oaiPmhUrls[] = trim($oaiPmhNode -> nodeValue);
			}
			foreach ($organizationNodes as $organizationNode) {
				if (($idNodes = $xpath -> query('./field[@name = "organizationid"]/@value', $organizationNode)) == FALSE)
					throw new Exception('error parsing datasources');
				if (($shortNameNodes = $xpath -> query('./field[@name = "legalname"]/@value', $organizationNode)) == FALSE)
					throw new Exception('error parsing datasources');
				if (($nameNodes = $xpath -> query('./field[@name = "legalshortname"]/@value', $organizationNode)) == FALSE)
					throw new Exception('error parsing datasources');
				if (($countryNodes = $xpath -> query('./field[@name = "countryname"]/@value', $organizationNode)) == FALSE)
					throw new Exception('error parsing datasources');
				$organization = new JObject();
				$organization -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$organization -> shortName = (($shortNameNode = $shortNameNodes -> item(0)) == NULL) ? NULL : trim($shortNameNode -> nodeValue);
				$organization -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
				$organization -> country = (($countryNode = $countryNodes -> item(0)) == NULL) ? NULL : trim($countryNode -> nodeValue);
				if (($organization -> id != NULL) || ($organization -> shortName != NULL) || ($organization -> name != NULL) || ($organization -> country != NULL))
					$datasource -> organizations[] = $organization;
			}
			if (($datasource -> id != NULL) || ($datasource -> type != NULL) || ($datasource -> compatibility != NULL) || ($datasource -> url != NULL) || ($datasource -> name != NULL) || ($datasource -> englishName != NULL) || ($datasource -> items != NULL) || ($datasource -> date != NULL) || ($datsource -> languages != NULL) || ($datasource -> policies != NULL) || ($datasource -> contents != NULL) || ($datasource -> oaiPmhUrls != NULL) || ($datasource -> description != NULL) || ($datasource -> organizations != NULL))
				$datasources[] = $datasource;
		}
		return $datasources;
	}
	
	// Parse a single publication from a search service XML response.
	// xpath the DOMXPath to parse
	// return publication (object)
	private function parsePublication($xpath,$locale) {
		if ((($resultsNodes = $xpath -> query('/response/results/result')) == FALSE) || (($resultNode = $resultsNodes -> item(0)) == NULL)) // result
			throw new Exception('error parsing publication');
		if (($idNodes = $xpath -> query('./field[@name = "resultId"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
		if (($titleNodes = $xpath -> query('./field[@name = "title"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');			
		if (($authorNodes = $xpath -> query('./field[@name = "author"]', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');	
		if (($dateNodes = $xpath -> query('./field[@name = "dateofacceptance"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');	
		if (($publisherNodes = $xpath -> query('./field[@name = "publisher"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
		if (($languageNodes = $xpath -> query('./field[@name = "language"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
		if (($typeNodes = $xpath -> query('./field[@name ="resulttypename"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
		if (($subjectNodes = $xpath -> query('./field[@name = "subject"]', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
		if (($embargoEndDateNodes = $xpath -> query('./field[@name = "embargoenddate"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
		if (($descriptionNodes = $xpath -> query('./field[@name = "description"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
		if (($datasourceNodes = $xpath -> query('./field[@name = "datasource"]', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
		if (($collectedFromNodes = $xpath -> query('./field[@name = "collectedfrom"]', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
		if (($sourceNodes = $xpath -> query('./field[@name = "source"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
		if (($projectNodes = $xpath -> query('./field[@name = "project"]', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
		if (($pidNodes = $xpath -> query('./field[@name = "pid"]', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
		if (($similarNodes = $xpath -> query('./field[@name = "hasAmongTopNSimilarDocuments"]', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
        if (($relatedNodes = $xpath -> query('./field[@name = "isRelatedTo"]', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
		if (($externalReferenceNodes = $xpath -> query('./field[@name = "externalreference"]', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');
		if (($contextNodes = $xpath -> query('./field[@name = "context"]', $resultNode)) == FALSE)
			throw new Exception('error parsing publication');		
		$publication = new JObject();
		$publication -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
		$publication -> source = 'openaire';
		$publication -> accessMode = NULL;
		$publication -> url = NULL;
		$publication -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
		$publication -> authors = array();
		$publication -> year = (($dateNode = $dateNodes -> item(0)) == NULL) ? NULL : intval(trim($dateNode -> nodeValue));
		$publication -> date = ($dateNode == NULL) ? NULL : strtotime(trim($dateNode -> nodeValue));		
		$publication -> publisher = (($publisherNode = $publisherNodes -> item(0)) == NULL) ? NULL : trim($publisherNode -> nodeValue);
		$publication -> languages = array();
		$publication -> type = array();
		$publication -> subjects = array();
		$publication -> embargoEndDate = (($embargoEndDateNode = $embargoEndDateNodes -> item(0)) == NULL) ? NULL : strtotime(trim($embargoEndDateNode -> nodeValue));
		$publication -> description = (($descriptionNode = $descriptionNodes -> item(0)) == NULL) ? NULL : trim($descriptionNode -> nodeValue);
		$publication -> datasources = array();
		$publication -> collectedFrom = array();
		$publication -> sources = array();
		$publication -> projects = array();
		$publication -> pids = array();
        $publication -> similarPublications = array();
		$publication -> relatedPublications = array();
		$publication -> relatedDatasets = array();
		$publication -> externalPublications = array();
		$publication -> externalDatasets = array();
		$publication -> contexts = array();
		foreach ($authorNodes as $authorNode) {
			if (($idNodes = $xpath -> query('./field[@name = "personId"]/@value', $authorNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($fullNameNodes = $xpath -> query('./field[@name = "fullname"]/@value', $authorNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($rankingNodes = $xpath -> query('./field[@name = "ranking"]/@value', $authorNode)) == FALSE)
				throw new Exception('error parsing publication');
			$author = new JObject();
			$author -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$author -> lastName = NULL;
			$author -> firstName = NULL;
			$author -> fullName = (($fullNameNode = $fullNameNodes -> item(0)) == NULL) ? NULL : trim($fullNameNode -> nodeValue);
			$author -> ranking = (($rankingNode = $rankingNodes -> item(0)) == NULL) ? 0 : intval(trim($rankingNode -> nodeValue));
			if (($author -> id != NULL) || ($author -> lastName != NULL) || ($author -> firstName != NULL) || ($author -> fullName != NULL))
				$publication -> authors[] = $author;
			usort($publication -> authors, function ($author1, $author2) {return $author1 -> ranking - $author2 -> ranking;});
		}
		foreach ($languageNodes as $languageNode) {
			if ((($language = trim($languageNode -> nodeValue)) != NULL) && ($language != self :: UNDETERMINED))
				$publication -> languages[] = $language;
		}
		foreach ($subjectNodes as $subjectNode) {
			if (($titleNodes = $xpath -> query('./@value', $subjectNode)) == FALSE)
					throw new Exception('error parsing publications');
            if (($inferredNodes = $xpath -> query('./field[@name = "inferred"]/@value', $subjectNode)) == FALSE)
					throw new Exception('error parsing publications');
			if (($trustNodes = $xpath -> query('./field[@name = "trust"]/@value', $subjectNode)) == FALSE)
					throw new Exception('error parsing publications');
			if (($provenanceNodes = $xpath -> query('./field[@name = "provenance"]/@value', $subjectNode)) == FALSE)
					throw new Exception('error parsing publications');
			$subject = new JObject();
            $subject -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
            $subject -> inferred = (($inferredNode = $inferredNodes -> item(0)) == NULL) ? NULL : trim($inferredNode -> nodeValue)=="true"?true:false;
			$subject -> trust = (($trustNode = $trustNodes -> item(0)) == NULL) ? NULL : trim($trustNode -> nodeValue);
			$subject -> provenance = (($provenanceNode = $provenanceNodes -> item(0)) == NULL) ? NULL : trim($provenanceNode -> nodeValue);
            if (($subject -> title != NULL) || ($subject -> inferred != NULL) || ($subject -> trust != NULL) || ($subject -> provenance != NULL))
					$publication -> subjects[] = $subject;
		}
		foreach ($datasourceNodes as $datasourceNode) {
			if (($idNodes = $xpath -> query('./field[@name = "hostedby"]/@value_original', $datasourceNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($nameNodes = $xpath -> query('./field[@name = "hostedby"]/@value', $datasourceNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($urlNodes = $xpath -> query('./field[@name = "url"]/@value', $datasourceNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($accessModeNodes = $xpath -> query('./field[@name = "licenceid"]/@value_original', $datasourceNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($typeNameNodes = $xpath -> query('./field[@name = "typename"]/@value', $datasourceNode)) == FALSE)
				throw new Exception('error parsing publication');
			$datasource = new JObject();
			$datasource -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$datasource -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
			$datasource -> url = (($urlNode = $urlNodes -> item(0)) == NULL) ? NULL : trim($urlNode -> nodeValue);
			$datasource -> accessMode = (($accessModeNode = $accessModeNodes -> item(0)) == NULL) ? NULL : trim($accessModeNode -> nodeValue);
			$datasource -> type = (($typeNameNode = $typeNameNodes -> item(0)) == NULL) ? NULL : trim($typeNameNode -> nodeValue);
			
			if (($datasource -> url != NULL) && ((($datasource -> accessMode == self :: DATASOURCE_ACCESS_OPEN) && (($publication -> accessMode == NULL) || ($publication -> accessMode == self :: UNKNOWN) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_EMBARGO))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_EMBARGO) &&  (($publication -> accessMode == NULL) || ($publication -> accessMode == self :: UNKNOWN) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED) && (($publication -> accessMode == NULL) || ($publication -> accessMode == self :: UNKNOWN) || ($publication -> accessMode == self :: DATASOURCE_ACCESS_CLOSED))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) && (($publication -> accessMode == NULL) || ($publication -> accessMode == self :: UNKNOWN))) || (($datasource -> accessMode == self :: UNKNOWN) && ($publication -> accessMode == NULL)) || ((($datasource -> accessMode == NULL) && ($publication -> accessMode == NULL) && ($publication -> url == NULL))))) {
				$publication -> accessMode = $datasource -> accessMode;
				$publication -> url = $datasource -> url;

				if (!in_array($datasource->type, $publication->type)) {
					array_push ($publication -> type,  $datasource -> type);
				}
			}
			if (($datasource -> id != NULL) || ($datasource -> name != NULL) || ($datasource -> url != NULL) || ($datasource -> accessMode != NULL))
				$publication -> datasources[] = $datasource;
		}
		foreach ($collectedFromNodes as $collectedFromNode) {
			if (($idNodes = $xpath -> query('./@value_original', $collectedFromNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($nameNodes = $xpath -> query('./@value', $collectedFromNode)) == FALSE)
				throw new Exception('error parsing publication');
			$collectedFrom = new JObject();
			$collectedFrom -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$collectedFrom -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
			if (($collectedFrom -> id != NULL) || ($collectedFrom -> name != NULL))
				$publication -> collectedFrom[] = $collectedFrom;
		}
		foreach ($sourceNodes as $sourceNode) {
			if (($source = trim($sourceNode -> nodeValue)) != NULL)
				$publication -> sources[] = $source;
		}
		foreach ($projectNodes as $projectNode) {
			if (($idNodes = $xpath -> query('./field[@name = "projectId"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($inferredNodes = $xpath -> query('./field[@name = "inferred"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing publication');
            if (($trustNodes = $xpath -> query('./field[@name = "trust"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing publication');
            if (($provenanceNodes = $xpath -> query('./field[@name = "provenance"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing publication');
            if (($acronymNodes = $xpath -> query('./field[@name = "projectacronym"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($titleNodes = $xpath -> query('./field[@name = "projecttitle"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($codeNodes = $xpath -> query('./field[@name = "projectcode"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing publication');
            if (($fundingNodes = $xpath -> query('./field[@name = "funding"]', $projectNode)) == FALSE)
				throw new Exception('error parsing publication');
		    
			
			$project = new JObject();
			$project -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$project -> acronym = (($acronymNode = $acronymNodes -> item(0)) == NULL) ? NULL : ((trim($acronymNode -> nodeValue) == self :: UNKNOWN) ? NULL : trim($acronymNode -> nodeValue));
			$project -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
			$project -> code = (($codeNode = $codeNodes -> item(0)) == NULL) ? NULL : trim($codeNode -> nodeValue);
            $project -> inferred = (($inferredNode = $inferredNodes -> item(0)) == NULL) ? NULL : trim($inferredNode -> nodeValue)=="true"?true:false;
			$project -> trust = (($trustNode = $trustNodes -> item(0)) == NULL) ? NULL : trim($trustNode -> nodeValue);
            $project -> provenance = (($provenanceNode = $provenanceNodes -> item(0)) == NULL) ? NULL : trim($provenanceNode -> nodeValue);
            $project -> funding = new JObject();
			if (($fundingNode = $fundingNodes -> item(0)) == NULL) ;
			else
			{
			    if (($funding0Nodes = $xpath -> query('./field[@name = "funding_level_0"]/@value', $fundingNode)) == FALSE)
				    throw new Exception('error parsing publication test');
			    $project -> funding->funding_level_0 = (($funding0Node = $funding0Nodes -> item(0)) == NULL) ? NULL : trim($funding0Node -> nodeValue);
			}
			
			if (($project -> id != NULL) || ($project -> acronym != NULL) || ($project -> title != NULL) || ($project -> code != NULL))
				$publication -> projects[] = $project;
		}
		foreach ($pidNodes as $pidNode) {
			if (($classNodes = $xpath -> query('./field[@name = "classid"]/@value', $pidNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($valueNodes = $xpath -> query('./field[@name = "value"]/@value', $pidNode)) == FALSE)
				throw new Exception('error parsing publication');
			$pid = new JObject();
			$pid -> clazz = (($classNode = $classNodes -> item(0)) == NULL) ? NULL : trim($classNode -> nodeValue);
			$pid -> value = (($valueNode = $valueNodes -> item(0)) == NULL) ? NULL : trim($valueNode -> nodeValue);
			if (($pid -> clazz != NULL) && ($pid -> value != NULL))
				$publication -> pids[] = $pid;
		}
        foreach ($similarNodes as $similarNode) {
			if (($typeNodes = $xpath -> query('./field[@name = "resulttypeid"]/@value', $similarNode)) == FALSE)
				throw new Exception('error parsing publication');
                        if (($typeNameNodes = $xpath -> query('./field[@name = "resulttypename"]/@value', $similarNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($idNodes = $xpath -> query('./field[@name = "resultid"]/@value', $similarNode)) == FALSE)
				throw new Exception('error parsing publication');
                        if (($inferredNodes = $xpath -> query('./field[@name = "inferred"]/@value', $similarNode)) == FALSE)
				throw new Exception('error parsing publication');
                        if (($trustNodes = $xpath -> query('./field[@name = "trust"]/@value', $similarNode)) == FALSE)
				throw new Exception('error parsing publication');
                        if (($provenanceNodes = $xpath -> query('./field[@name = "provenance"]/@value', $similarNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($titleNodes = $xpath -> query('./field[@name = "title"]/@value', $similarNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($yearNodes = $xpath -> query('./field[@name = "dateofacceptance"]/@value', $similarNode)) == FALSE)
				throw new Exception('error parsing publication');
                        
            $similarPublication = new JObject();
			$similarPublication -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$similarPublication -> source = 'openaire';
			$similarPublication -> url = NULL;
			$similarPublication -> accessMode = NULL;
			$similarPublication -> datasources = array();
			$similarPublication -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
            $similarPublication -> inferred = (($inferredNode = $inferredNodes -> item(0)) == NULL) ? NULL : trim($inferredNode -> nodeValue)=="true"?true:false;
			$similarPublication -> trust = (($trustNode = $trustNodes -> item(0)) == NULL) ? NULL : trim($trustNode -> nodeValue);
            $similarPublication -> provenance = (($provenanceNode = $provenanceNodes -> item(0)) == NULL) ? NULL : trim($provenanceNode -> nodeValue);
            $similarPublication -> authors = array();
			$similarPublication -> year = (($yearNode = $yearNodes -> item(0)) == NULL) ? NULL : intval(trim($yearNode -> nodeValue));
			$similarPublication -> projects = array();
			$similarPublication -> embargoEndDate = NULL;
			$similarPublication -> description = NULL;
			if (($similarPublication -> id != NULL) || ($similarPublication -> title != NULL) || ($similarPublication -> year != NULL)){
            	$publication -> similarPublications[] = $similarPublication;
                        }
                }
		foreach ($relatedNodes as $relatedNode) {
			if (($typeNodes = $xpath -> query('./field[@name = "resulttypeid"]/@value', $relatedNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($idNodes = $xpath -> query('./field[@name = "resultid"]/@value', $relatedNode)) == FALSE)
				throw new Exception('error parsing publication');
            if (($inferredNodes = $xpath -> query('./field[@name = "inferred"]/@value', $relatedNode)) == FALSE)
				throw new Exception('error parsing publication');
            if (($trustNodes = $xpath -> query('./field[@name = "trust"]/@value', $relatedNode)) == FALSE)
				throw new Exception('error parsing publication');
            if (($provenanceNodes = $xpath -> query('./field[@name = "provenance"]/@value', $relatedNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($titleNodes = $xpath -> query('./field[@name = "title"]/@value', $relatedNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($yearNodes = $xpath -> query('./field[@name = "dateofacceptance"]/@value', $relatedNode)) == FALSE)
				throw new Exception('error parsing publication');
			switch ((($typeNode = $typeNodes -> item(0)) == NULL) ? NULL : trim($typeNode -> nodeValue)) {
			case self :: PUBLICATION:
				$relatedPublication = new JObject();
				$relatedPublication -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$relatedPublication -> source = 'openaire';
				$relatedPublication -> url = NULL;
				$relatedPublication -> accessMode = NULL;
				$relatedPublication -> datasources = array();
				$relatedPublication -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
                $relatedPublication -> inferred = (($inferredNode = $inferredNodes -> item(0)) == NULL) ? NULL : trim($inferredNode -> nodeValue)=="true"?true:false;
				$relatedPublication -> trust = (($trustNode = $trustNodes -> item(0)) == NULL) ? NULL : trim($trustNode -> nodeValue);
                $relatedPublication -> provenance = (($provenanceNode = $provenanceNodes -> item(0)) == NULL) ? NULL : trim($provenanceNode -> nodeValue);
                $relatedPublication -> authors = array();
				$relatedPublication -> year = (($yearNode = $yearNodes -> item(0)) == NULL) ? NULL : intval(trim($yearNode -> nodeValue));
				$relatedPublication -> projects = array();
				$relatedPublication -> embargoEndDate = NULL;
				$relatedPublication -> description = NULL;
				if (($relatedPublication -> id != NULL) || ($relatedPublication -> title != NULL) || ($relatedPublication -> year != NULL))
					$publication -> relatedPublications[] = $relatedPublication;
				break;
			case self :: DATASET:
				$relatedDataset = new JObject();
				$relatedDataset -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$relatedDataset -> source = 'openaire';
				$relatedDataset -> url = NULL;
				$relatedDataset -> accessMode = NULL;
				$relatedDataset -> datasources = array();
				$relatedDataset -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
				$relatedDataset -> inferred = (($inferredNode = $inferredNodes -> item(0)) == NULL) ? NULL : trim($inferredNode -> nodeValue)=="true"?true:false;
				$relatedDataset -> trust = (($trustNode = $trustNodes -> item(0)) == NULL) ? NULL : trim($trustNode -> nodeValue);
                $relatedDataset -> provenance = (($provenanceNode = $provenanceNodes -> item(0)) == NULL) ? NULL : trim($provenanceNode -> nodeValue);
                $relatedDataset -> authors = array();
				$relatedDataset -> year = (($yearNode = $yearNodes -> item(0)) == NULL) ? NULL : intval(trim($yearNode -> nodeValue));
				$relatedDataset -> projects = array();
				$relatedDataset -> embargoEndDate = NULL;
				$relatedDataset -> description = NULL;
				if (($relatedDataset -> id != NULL) || ($relatedDataset -> title != NULL) || ($relatedDataset -> year != NULL))
					$publication -> relatedDatasets[] = $relatedDataset;
				break;
			}
		}
		foreach ($externalReferenceNodes as $externalReferenceNode) {
			if (($typeNodes = $xpath -> query('./field[@name = "typeid"]/@value', $externalReferenceNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($idNodes = $xpath -> query('./field[@name = "refidentifier"]/@value', $externalReferenceNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($urlNodes = $xpath -> query('./field[@name = "url"]/@value', $externalReferenceNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($labelNodes = $xpath -> query('./field[@name = "label"]/@value', $externalReferenceNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($siteNameNodes = $xpath -> query('./field[@name = "sitename"]/@value', $externalReferenceNode)) == FALSE)
				throw new Exception('error parsing publication');
			switch ((($typeNode = $typeNodes -> item(0)) == NULL) ? NULL : trim($typeNode -> nodeValue)) {
			case self :: PUBLICATION:
				$externalPublication = new JObject();
				$externalPublication -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$externalPublication -> source = NULL;
				$externalPublication -> url = (($urlNode = $urlNodes -> item(0)) == NULL) ? NULL : trim($urlNode -> nodeValue);
				$externalPublication -> accessMode = NULL;
				$externalPublication -> datasources = array();
				$externalPublication -> title = (($labelNode = $labelNodes -> item(0)) == NULL) ? NULL : trim($labelNode -> nodeValue);
				$externalPublication -> authors = array();
				$site = new JObject();
				$site -> id = NULL;
				$site -> lastName = NULL;
				$site -> firstName = NULL;
				$site -> fullName = (($siteNameNode = $siteNameNodes -> item(0)) == NULL) ? NULL : trim($siteNameNode -> nodeValue);
				if ($site -> fullName != NULL)
					$externalPublication -> authors[] = $site;
				$externalPublication -> year = NULL;
				$externalPublication -> projects = array();
				$externalPublication -> embargoEndDate = NULL;
				$externalPublication -> description = NULL;
				if (($externalPublication -> id != NULL) || ($externalPublication -> url != NULL) || ($externalPublication -> title != NULL))
					$publication -> externalPublications[] = $externalPublication;
				break;
			case self :: DATASET:
				$externalDataset = new JObject();
				$externalDataset -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$externalDataset -> source = NULL;
				$externalDataset -> url = (($urlNode = $urlNodes -> item(0)) == NULL) ? NULL : trim($urlNode -> nodeValue);
				$externalDataset -> accessMode = NULL;
				$externalDataset -> datasources = array();
				$externalDataset -> title = (($labelNode = $labelNodes -> item(0)) == NULL) ? NULL : trim($labelNode -> nodeValue);
				$externalDataset -> authors = array();
				$site = new JObject();
				$site -> id = NULL;
				$site -> lastName = NULL;
				$site -> firstName = NULL;
				$site -> fullName = (($siteNameNode = $siteNameNodes -> item(0)) == NULL) ? NULL : trim($siteNameNode -> nodeValue);
				if ($site -> fullName != NULL)
					$externalDataset -> authors[] = $site;
				$externalDataset -> year = NULL;
				$externalDataset -> projects = array();
				$externalDataset -> embargoEndDate = NULL;
				$externalDataset -> description = NULL;
				if (($externalDataset -> id != NULL) || ($externalDataset -> url != NULL) || ($externalDataset -> title != NULL))
					$publication -> externalDatasets[] = $externalDataset;
			}				
		}
		foreach ($contextNodes as $contextNode) {
			if (($idNodes = $xpath -> query('./@value', $contextNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($nameNodes = $xpath -> query('./@value_original', $contextNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($typeNodes = $xpath -> query('./field[@name = "contexttype"]/@value', $contextNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($categoryNodes = $xpath -> query('./field[@name = "category"]', $contextNode)) == FALSE)
				throw new Exception('error parsing publication');
			$context = new JObject();
			$context -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$context -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
			$context -> type = (($typeNode = $typeNodes -> item(0)) == NULL) ? NULL : trim($typeNode -> nodeValue);
			$context -> categories = array();
			foreach ($categoryNodes as $categoryNode) {
				if (($idNodes = $xpath -> query('./@value_original', $categoryNode)) == FALSE)
					throw new Exception('error parsing publication');
				if (($nameNodes = $xpath -> query('./@value', $categoryNode)) == FALSE)
					throw new Exception('error parsing publication');
				if (($conceptNodes = $xpath -> query('./field[@name = "concept"]', $categoryNode)) == FALSE)
					throw new Exception('error parsing publication');
				$category = new JObject();
				$category -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$category -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
				$category -> concepts = array();
				foreach ($conceptNodes as $conceptNode) {
					if (($idNodes = $xpath -> query('./@value_original', $conceptNode)) == FALSE)
						throw new Exception('error parsing publication');
					if (($nameNodes = $xpath -> query('./@value', $conceptNode)) == FALSE)
						throw new Exception('error parsing publication');
					$concept = new JObject();
					$concept -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
					$concept -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
					if (($concept -> id != NULL) || ($concept -> name != NULL))
						$category -> concepts[] = $concept;
				}
				if (($category -> id != NULL) || ($category -> name != NULL) || ($category -> concepts != NULL))
					$context -> categories[] = $category;
			}
			if (($context -> id != NULL) || ($context -> name != NULL) || ($context -> categories != NULL))
				$publication -> contexts[] = $context;
		}
		return $publication;
	}
	
	// Parse a single dataset from a search service XML response.
	// xpath the DOMXPath to parse
	// return dataset (object)
	private function parseDataset($xpath,$locale) {
		if ((($resultsNodes = $xpath -> query('/response/results/result')) == FALSE) || (($resultNode = $resultsNodes -> item(0)) == NULL)) // result
			throw new Exception('error parsing dataset');
		if (($idNodes = $xpath -> query('./field[@name = "resultId"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');
		if (($titleNodes = $xpath -> query('./field[@name = "title"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');			
		if (($authorNodes = $xpath -> query('./field[@name = "author"]', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');	
		if (($dateNodes = $xpath -> query('./field[@name = "dateofacceptance"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');	
		if (($publisherNodes = $xpath -> query('./field[@name = "publisher"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');
		if (($languageNodes = $xpath -> query('./field[@name = "language"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');
		if (($typeNodes = $xpath -> query('./field[@name ="resulttypename"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');
		if (($subjectNodes = $xpath -> query('./field[@name = "subject"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');
		if (($embargoEndDateNodes = $xpath -> query('./field[@name = "embargoenddate"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');
		if (($descriptionNodes = $xpath -> query('./field[@name = "description"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');
		if (($datasourceNodes = $xpath -> query('./field[@name = "datasource"]', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');
		if (($collectedFromNodes = $xpath -> query('./field[@name = "collectedfrom"]', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');
		if (($sourceNodes = $xpath -> query('./field[@name = "source"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');
		if (($projectNodes = $xpath -> query('./field[@name = "project"]', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');
		if (($pidNodes = $xpath -> query('./field[@name = "pid"]', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');
		if (($relatedNodes = $xpath -> query('./field[@name = "isRelatedTo"]', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');
		if (($externalReferenceNodes = $xpath -> query('./field[@name = "externalreference"]', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');
		if (($contextNodes = $xpath -> query('./field[@name = "context"]', $resultNode)) == FALSE)
			throw new Exception('error parsing dataset');		
		$dataset = new JObject();
		$dataset -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
		$dataset -> source = 'openaire';
		$dataset -> accessMode = NULL;
		$dataset -> url = NULL;
		$dataset -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
		$dataset -> authors = array();
		$dataset -> year = (($dateNode = $dateNodes -> item(0)) == NULL) ? NULL : intval(trim($dateNode -> nodeValue));
		$dataset -> date = ($dateNode == NULL) ? NULL : strtotime(trim($dateNode -> nodeValue));		
		$dataset -> publisher = (($publisherNode = $publisherNodes -> item(0)) == NULL) ? NULL : trim($publisherNode -> nodeValue);
		$dataset -> languages = array();
		$dataset -> type = (($typeNode = $typeNodes -> item(0)) == NULL) ? NULL : trim($typeNode -> nodeValue);
		$dataset -> subjects = array();
		$dataset -> embargoEndDate = (($embargoEndDateNode = $embargoEndDateNodes -> item(0)) == NULL) ? NULL : strtotime(trim($embargoEndDateNode -> nodeValue));
		$dataset -> description = (($descriptionNode = $descriptionNodes -> item(0)) == NULL) ? NULL : trim($descriptionNode -> nodeValue);
		$dataset -> datasources = array();
		$dataset -> collectedFrom = array();
		$dataset -> sources = array();
		$dataset -> projects = array();
		$dataset -> pids = array();
		$dataset -> relatedPublications = array();
		$dataset -> relatedDatasets = array();
		$dataset -> externalPublications = array();
		$dataset -> externalDatasets = array();
		$dataset -> contexts = array();
		foreach ($authorNodes as $authorNode) {
			if (($idNodes = $xpath -> query('./field[@name = "personId"]/@value', $authorNode)) == FALSE)
				throw new Exception('error parsing dataset');
			if (($fullNameNodes = $xpath -> query('./field[@name = "fullname"]/@value', $authorNode)) == FALSE)
				throw new Exception('error parsing dataset');
			if (($rankingNodes = $xpath -> query('./field[@name = "ranking"]/@value', $authorNode)) == FALSE)
				throw new Exception('error parsing publication');
			$author = new JObject();
			$author -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$author -> lastName = NULL;
			$author -> firstName = NULL;
			$author -> fullName = (($fullNameNode = $fullNameNodes -> item(0)) == NULL) ? NULL : trim($fullNameNode -> nodeValue);
			$author -> ranking = (($rankingNode = $rankingNodes -> item(0)) == NULL) ? 0 : intval(trim($rankingNode -> nodeValue));
			if (($author -> id != NULL) || ($author -> lastName != NULL) || ($author -> firstName != NULL) || ($author -> fullName != NULL))
				$dataset -> authors[] = $author;
			usort($dataset -> authors, function ($author1, $author2) {return $author1 -> ranking - $author2 -> ranking;});
		}
		foreach ($languageNodes as $languageNode) {
			if ((($language = trim($languageNode -> nodeValue)) != NULL) && ($language != self :: UNDETERMINED))
				$dataset -> languages[] = $language;
		}
		foreach ($subjectNodes as $subjectNode) {
			if (($subject = trim($subjectNode -> nodeValue)) != NULL)
				$dataset -> subjects[] = $subject;
		}
		foreach ($datasourceNodes as $datasourceNode) {
			if (($idNodes = $xpath -> query('./field[@name = "hostedby"]/@value_original', $datasourceNode)) == FALSE)
				throw new Exception('error parsing dataset');
			if (($nameNodes = $xpath -> query('./field[@name = "hostedby"]/@value', $datasourceNode)) == FALSE)
				throw new Exception('error parsing dataset');
			if (($urlNodes = $xpath -> query('./field[@name = "url"]/@value', $datasourceNode)) == FALSE)
				throw new Exception('error parsing dataset');
			if (($accessModeNodes = $xpath -> query('./field[@name = "licenceid"]/@value_original', $datasourceNode)) == FALSE)
				throw new Exception('error parsing dataset');
			$datasource = new JObject();
			$datasource -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$datasource -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
			$datasource -> url = (($urlNode = $urlNodes -> item(0)) == NULL) ? NULL : trim($urlNode -> nodeValue);
// TODO
if (substr($datasource -> url, 0, strlen('http://dx.doi.org/http://zenodo.org/record/')) == 'http://dx.doi.org/http://zenodo.org/record/') {
$url = substr($datasource -> url, strlen('http://dx.doi.org/'));
JLog :: add('Converting datasource URL ' . $datasource -> url . ' to ' . $url, JLog :: DEBUG, self :: LOG);
$datasource -> url = $url;
}
// TODO
			$datasource -> accessMode = (($accessModeNode = $accessModeNodes -> item(0)) == NULL) ? NULL : trim($accessModeNode -> nodeValue);
			if (($datasource -> url != NULL) && ((($datasource -> accessMode == self :: DATASOURCE_ACCESS_OPEN) && (($dataset -> accessMode == NULL) || ($dataset -> accessMode == self :: UNKNOWN) || ($dataset -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) || ($dataset -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED) || ($dataset -> accessMode == self :: DATASOURCE_ACCESS_EMBARGO))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_EMBARGO) &&  (($dataset -> accessMode == NULL) || ($dataset -> accessMode == self :: UNKNOWN) || ($dataset -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) || ($dataset -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_RESTRICTED) && (($dataset -> accessMode == NULL) || ($dataset -> accessMode == self :: UNKNOWN) || ($dataset -> accessMode == self :: DATASOURCE_ACCESS_CLOSED))) || (($datasource -> accessMode == self :: DATASOURCE_ACCESS_CLOSED) && (($dataset -> accessMode == NULL) || ($dataset -> accessMode == self :: UNKNOWN))) || (($datasource -> accessMode == self :: UNKNOWN) && ($dataset -> accessMode == NULL)) || ((($datasource -> accessMode == NULL) && ($dataset -> accessMode == NULL) && ($dataset -> url == NULL))))) {
				$dataset -> accessMode = $datasource -> accessMode;
				$dataset -> url = $datasource -> url;
			}
			if (($datasource -> id != NULL) || ($datasource -> name != NULL) || ($datasource -> url != NULL) || ($datasource -> accessMode != NULL))
				$dataset -> datasources[] = $datasource;
		}
		foreach ($collectedFromNodes as $collectedFromNode) {
			if (($idNodes = $xpath -> query('./@value_original', $collectedFromNode)) == FALSE)
				throw new Exception('error parsing dataset');
			if (($nameNodes = $xpath -> query('./@value', $collectedFromNode)) == FALSE)
				throw new Exception('error parsing dataset');
			$collectedFrom = new JObject();
			$collectedFrom -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$collectedFrom -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
			if (($collectedFrom -> id != NULL) || ($collectedFrom -> name != NULL))
				$dataset -> collectedFrom[] = $collectedFrom;
		}
		foreach ($sourceNodes as $sourceNode) {
			if (($source = trim($sourceNode -> nodeValue)) != NULL)
				$dataset -> sources[] = $source;
		}
		foreach ($projectNodes as $projectNode) {
			if (($idNodes = $xpath -> query('./field[@name = "projectId"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing dataset');
			if (($acronymNodes = $xpath -> query('./field[@name = "projectacronym"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing dataset');
			if (($titleNodes = $xpath -> query('./field[@name = "projecttitle"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing dataset');
			if (($codeNodes = $xpath -> query('./field[@name = "projectcode"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing dataset');
			$project = new JObject();
			$project -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$project -> acronym = (($acronymNode = $acronymNodes -> item(0)) == NULL) ? NULL : ((trim($acronymNode -> nodeValue) == self :: UNKNOWN) ? NULL : trim($acronymNode -> nodeValue));
			$project -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
			$project -> code = (($codeNode = $codeNodes -> item(0)) == NULL) ? NULL : trim($codeNode -> nodeValue);
			if (($project -> id != NULL) || ($project -> acronym != NULL) || ($project -> title != NULL) || ($project -> code != NULL))
				$dataset -> projects[] = $project;
		}
		foreach ($pidNodes as $pidNode) {
			if (($classNodes = $xpath -> query('./field[@name = "classid"]/@value', $pidNode)) == FALSE)
				throw new Exception('error parsing dataset');
			if (($valueNodes = $xpath -> query('./field[@name = "value"]/@value', $pidNode)) == FALSE)
				throw new Exception('error parsing dataset');
			$pid = new JObject();
			$pid -> clazz = (($classNode = $classNodes -> item(0)) == NULL) ? NULL : trim($classNode -> nodeValue);
			$pid -> value = (($valueNode = $valueNodes -> item(0)) == NULL) ? NULL : trim($valueNode -> nodeValue);
			if (($pid -> clazz != NULL) && ($pid -> value != NULL))
				$dataset -> pids[] = $pid;
		}
		foreach ($relatedNodes as $relatedNode) {
			if (($typeNodes = $xpath -> query('./field[@name = "resulttypeid"]/@value', $relatedNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($idNodes = $xpath -> query('./field[@name = "resultid"]/@value', $relatedNode)) == FALSE)
				throw new Exception('error parsing publication');
            if (($inferredNodes = $xpath -> query('./field[@name = "inferred"]/@value', $relatedNode)) == FALSE)
				throw new Exception('error parsing publication');
            if (($trustNodes = $xpath -> query('./field[@name = "trust"]/@value', $relatedNode)) == FALSE)
				throw new Exception('error parsing publication');
            if (($provenanceNodes = $xpath -> query('./field[@name = "provenance"]/@value', $relatedNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($titleNodes = $xpath -> query('./field[@name = "title"]/@value', $relatedNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($yearNodes = $xpath -> query('./field[@name = "dateofacceptance"]/@value', $relatedNode)) == FALSE)
				throw new Exception('error parsing publication');
			switch ((($typeNode = $typeNodes -> item(0)) == NULL) ? NULL : trim($typeNode -> nodeValue)) {
			case self :: PUBLICATION:
				$relatedPublication = new JObject();
				$relatedPublication -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$relatedPublication -> source = 'openaire';
				$relatedPublication -> url = NULL;
				$relatedPublication -> accessMode = NULL;
				$relatedPublication -> datasources = array();
				$relatedPublication -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
                $relatedPublication -> inferred = (($inferredNode = $inferredNodes -> item(0)) == NULL) ? NULL : trim($inferredNode -> nodeValue)=="true"?true:false;
				$relatedPublication -> trust = (($trustNode = $trustNodes -> item(0)) == NULL) ? NULL : trim($trustNode -> nodeValue);
                $relatedPublication -> provenance = (($provenanceNode = $provenanceNodes -> item(0)) == NULL) ? NULL : trim($provenanceNode -> nodeValue);
                $relatedPublication -> authors = array();
				$relatedPublication -> year = (($yearNode = $yearNodes -> item(0)) == NULL) ? NULL : intval(trim($yearNode -> nodeValue));
				$relatedPublication -> projects = array();
				$relatedPublication -> embargoEndDate = NULL;
				$relatedPublication -> description = NULL;
				if (($relatedPublication -> id != NULL) || ($relatedPublication -> title != NULL) || ($relatedPublication -> year != NULL))
					$dataset -> relatedPublications[] = $relatedPublication;
				break;
			case self :: DATASET:
				$relatedDataset = new JObject();
				$relatedDataset -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$relatedDataset -> source = 'openaire';
				$relatedDataset -> url = NULL;
				$relatedDataset -> accessMode = NULL;
				$relatedDataset -> datasources = array();
				$relatedDataset -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
				$relatedDataset -> inferred = (($inferredNode = $inferredNodes -> item(0)) == NULL) ? NULL : trim($inferredNode -> nodeValue)=="true"?true:false;
				$relatedDataset -> trust = (($trustNode = $trustNodes -> item(0)) == NULL) ? NULL : trim($trustNode -> nodeValue);
                $relatedDataset -> provenance = (($provenanceNode = $provenanceNodes -> item(0)) == NULL) ? NULL : trim($provenanceNode -> nodeValue);
                $relatedDataset -> authors = array();
				$relatedDataset -> year = (($yearNode = $yearNodes -> item(0)) == NULL) ? NULL : intval(trim($yearNode -> nodeValue));
				$relatedDataset -> projects = array();
				$relatedDataset -> embargoEndDate = NULL;
				$relatedDataset -> description = NULL;
				if (($relatedDataset -> id != NULL) || ($relatedDataset -> title != NULL) || ($relatedDataset -> year != NULL))
					$dataset -> relatedDatasets[] = $relatedDataset;
				break;
			}
		}
		foreach ($externalReferenceNodes as $externalReferenceNode) {
			if (($typeNodes = $xpath -> query('./field[@name = "typeid"]/@value', $externalReferenceNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($idNodes = $xpath -> query('./field[@name = "refidentifier"]/@value', $externalReferenceNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($urlNodes = $xpath -> query('./field[@name = "url"]/@value', $externalReferenceNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($labelNodes = $xpath -> query('./field[@name = "label"]/@value', $externalReferenceNode)) == FALSE)
				throw new Exception('error parsing publication');
			if (($siteNameNodes = $xpath -> query('./field[@name = "sitename"]/@value', $externalReferenceNode)) == FALSE)
				throw new Exception('error parsing publication');
			switch ((($typeNode = $typeNodes -> item(0)) == NULL) ? NULL : trim($typeNode -> nodeValue)) {
			case self :: PUBLICATION:
				$externalPublication = new JObject();
				$externalPublication -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$externalPublication -> source = NULL;
				$externalPublication -> url = (($urlNode = $urlNodes -> item(0)) == NULL) ? NULL : trim($urlNode -> nodeValue);
				$externalPublication -> accessMode = NULL;
				$externalPublication -> datasources = array();
				$externalPublication -> title = (($labelNode = $labelNodes -> item(0)) == NULL) ? NULL : trim($labelNode -> nodeValue);
				$externalPublication -> authors = array();
				$site = new JObject();
				$site -> id = NULL;
				$site -> lastName = NULL;
				$site -> firstName = NULL;
				$site -> fullName = (($siteNameNode = $siteNameNodes -> item(0)) == NULL) ? NULL : trim($siteNameNode -> nodeValue);
				if ($site -> fullName != NULL)
					$externalPublication -> authors[] = $site;
				$externalPublication -> year = NULL;
				$externalPublication -> projects = array();
				$externalPublication -> embargoEndDate = NULL;
				$externalPublication -> description = NULL;
				if (($externalPublication -> id != NULL) || ($externalPublication -> url != NULL) || ($externalPublication -> title != NULL))
					$dataset -> externalPublications[] = $externalPublication;
				break;
			case self :: DATASET:
				$externalDataset = new JObject();
				$externalDataset -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$externalDataset -> source = NULL;
				$externalDataset -> url = (($urlNode = $urlNodes -> item(0)) == NULL) ? NULL : trim($urlNode -> nodeValue);
				$externalDataset -> accessMode = NULL;
				$externalDataset -> datasources = array();
				$externalDataset -> title = (($labelNode = $labelNodes -> item(0)) == NULL) ? NULL : trim($labelNode -> nodeValue);
				$externalDataset -> authors = array();
				$site = new JObject();
				$site -> id = NULL;
				$site -> lastName = NULL;
				$site -> firstName = NULL;
				$site -> fullName = (($siteNameNode = $siteNameNodes -> item(0)) == NULL) ? NULL : trim($siteNameNode -> nodeValue);
				if ($site -> fullName != NULL)
					$externalDataset -> authors[] = $site;
				$externalDataset -> year = NULL;
				$externalDataset -> projects = array();
				$externalDataset -> embargoEndDate = NULL;
				$externalDataset -> description = NULL;
				if (($externalDataset -> id != NULL) || ($externalDataset -> url != NULL) || ($externalDataset -> title != NULL))
					$dataset -> externalDatasets[] = $externalDataset;
			}				
		}
		foreach ($contextNodes as $contextNode) {
			if (($idNodes = $xpath -> query('./@value', $contextNode)) == FALSE)
				throw new Exception('error parsing dataset');
			if (($nameNodes = $xpath -> query('./@value_original', $contextNode)) == FALSE)
				throw new Exception('error parsing dataset');
			if (($categoryNodes = $xpath -> query('./field[@name = "category"]', $contextNode)) == FALSE)
				throw new Exception('error parsing dataset');
			$context = new JObject();
			$context -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$context -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
			$context -> categories = array();
			foreach ($categoryNodes as $categoryNode) {
				if (($idNodes = $xpath -> query('./@value', $categoryNode)) == FALSE)
					throw new Exception('error parsing dataset');
				if (($nameNodes = $xpath -> query('./@value_original', $categoryNode)) == FALSE)
					throw new Exception('error parsing dataset');
				if (($conceptNodes = $xpath -> query('./field[@name = "concept"]', $categoryNode)) == FALSE)
					throw new Exception('error parsing dataset');
				$category = new JObject();
				$category -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
				$category -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
				$category -> concepts = array();
				foreach ($conceptNodes as $conceptNode) {
					if (($idNodes = $xpath -> query('./@value', $conceptNode)) == FALSE)
						throw new Exception('error parsing dataset');
					if (($nameNodes = $xpath -> query('./@value_original', $conceptNode)) == FALSE)
						throw new Exception('error parsing dataset');
					$concept = new JObject();
					$concept -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
					$concept -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
					if (($concept -> id != NULL) || ($concept -> name != NULL))
						$category -> concepts[] = $concept;
				}
				if (($category -> id != NULL) || ($category -> name != NULL) || ($category -> concepts != NULL))
					$context -> categories[] = $category;
			}
			if (($context -> id != NULL) || ($context -> name != NULL) || ($context -> categories != NULL))
				$dataset -> contexts[] = $context;
		}
		return $dataset;
	}
	
	// Parse a single project from a search service XML response.
	// xpath the DOMXPath to parse
	// return project (object)
	private function parseProject($xpath) {
		if ((($resultsNodes = $xpath -> query('/response/results/result')) == FALSE) || (($resultNode = $resultsNodes -> item(0)) == NULL))
			throw new Exception('error parsing project');
		if (($acronymNodes = $xpath -> query('./field[@name = "name"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
		if (($titleNodes = $xpath -> query('./field[@name = "title"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
		if (($funderNodes = $xpath -> query('./field[@name = "funding_level_0"]/field[@name = "fundingname"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
		if (($fundingStreamNodes = $xpath -> query('./field[@name = "funding_level_1"]/field[@name = "fundingname"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
		if (($scientificAreaNodes = $xpath -> query('./field[@name = "funding_level_2"]/field[@name = "fundingname"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
		if (($callNodes = $xpath -> query('./field[@name = "call_identifier"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
		if (($codeNodes = $xpath -> query('./field[@name = "code"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
		if (($startYearNodes = $xpath -> query('./field[@name = "startyear"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing project');			
		if (($startDateNodes = $xpath -> query('./field[@name = "startdate"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
		if (($endYearNodes = $xpath -> query('./field[@name = "endyear"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
		if (($endDateNodes = $xpath -> query('./field[@name = "enddate"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
		if (($sc39Nodes = $xpath -> query('./field[@name = "ec_sc39"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
	    if (($funding0Nodes = $xpath -> query('./field[@name = "funding_level_0"]', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
		if (($funding1Nodes = $xpath -> query('./field[@name = "funding_level_1"]', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
		if (($funding2Nodes = $xpath -> query('./field[@name = "funding_level_2"]', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
		if (($organizationNodes = $xpath -> query('./field[@name = "organization"]', $resultNode)) == FALSE)
			throw new Exception('error parsing project');
		$project = new JObject();
		$project -> acronym = (($acronymNode = $acronymNodes -> item(0)) == NULL) ? NULL : ((trim($acronymNode -> nodeValue) == self :: UNKNOWN) ? NULL : trim($acronymNode -> nodeValue));
		$project -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
		$project -> funder = (($funderNode = $funderNodes -> item(0)) == NULL) ? NULL : trim($funderNode -> nodeValue);
		$project -> fundingStream = (($fundingStreamNode = $fundingStreamNodes -> item(0)) == NULL) ? NULL : trim($fundingStreamNode -> nodeValue);
		$project -> scientificArea = (($scientificAreaNode = $scientificAreaNodes -> item(0)) == NULL) ? NULL : trim($scientificAreaNode -> nodeValue);
		$project -> call = (($callNode = $callNodes -> item(0)) == NULL) ? NULL : trim($callNode -> nodeValue);
		$project -> code = (($codeNode = $codeNodes -> item(0)) == NULL) ? NULL : trim($codeNode -> nodeValue);
		$project -> startYear = (($startYearNode = $startYearNodes -> item(0)) == NULL) ? NULL : intval(trim($startYearNode -> nodeValue));
		$project -> startDate = (($startDateNode = $startDateNodes -> item(0)) == NULL) ? NULL : strtotime(trim($startDateNode -> nodeValue));
		$project -> endYear =  (($endYearNode = $endYearNodes -> item(0)) == NULL) ? NULL : intval(trim($endYearNode -> nodeValue));
		$project -> endDate = (($endDateNode = $endDateNodes -> item(0)) == NULL) ? NULL : strtotime(trim($endDateNode -> nodeValue));
		$project -> sc39 = (($sc39Node = $sc39Nodes -> item(0)) == NULL) ? NULL : trim($sc39Node -> nodeValue);
		switch ($project -> sc39) {
		case 'true':
			$project -> sc39 = TRUE;
			break;
		case 'false':
			$project -> sc39 = FALSE;
			break;
		default:
			$project -> sc39 = NULL;
		}
        $project -> funding = new JObject();
        $project -> funding->funding_level_0 = NULL;
        $project -> funding->funding_level_1 = NULL;
        $project -> funding->funding_level_2 = NULL;
		if (($funding0Node = $funding0Nodes -> item(0)) == NULL) ;
		else
		{
		    if (($funding0NameNodes = $xpath -> query('./field[@name = "fundingname"]/@value', $funding0Node)) == FALSE)
		        throw new Exception('error parsing publication test');
		    $project -> funding -> funding_level_0 = (($funding0NameNode = $funding0NameNodes -> item(0)) == NULL) ? NULL : trim($funding0NameNode -> nodeValue);
		}
		if (($funding1Node = $funding1Nodes -> item(0)) == NULL) ;
		else
		{
		    if (($funding1NameNodes = $xpath -> query('./field[@name = "fundingname"]/@value', $funding1Node)) == FALSE)
		        throw new Exception('error parsing publication test');
		    $project -> funding -> funding_level_1 = (($funding1NameNode = $funding1NameNodes -> item(0)) == NULL) ? NULL : trim($funding1NameNode -> nodeValue);
		}
		if (($funding2Node = $funding2Nodes -> item(0)) == NULL) ;
		else
		{
		    if (($funding2NameNodes = $xpath -> query('./field[@name = "fundingname"]/@value', $funding2Node)) == FALSE)
		        throw new Exception('error parsing publication test');
		    $project -> funding -> funding_level_2 = (($funding2NameNode = $funding2NameNodes -> item(0)) == NULL) ? NULL : trim($funding2NameNode -> nodeValue);
		}	
		$project -> organizations = array();
		foreach ($organizationNodes as $organizationNode) {
			if (($idNodes = $xpath -> query('./field[@name = "organizationid"]/@value', $organizationNode)) == FALSE)
				throw new Exception('error parsing project');
			if (($shortNameNodes = $xpath -> query('./field[@name = "legalshortname"]/@value', $organizationNode)) == FALSE)
				throw new Exception('error parsing project');
			if (($nameNodes = $xpath -> query('./field[@name = "legalname"]/@value', $organizationNode)) == FALSE)
				throw new Exception('error parsing project');
			$organization = new JObject();
			$organization -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$organization -> shortName = (($shortNameNode = $shortNameNodes -> item(0)) == NULL) ? NULL : trim($shortNameNode -> nodeValue);
			$organization -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
			if (($organization -> id != NULL) || ($organization -> shortName != NULL) || ($organization -> name != NULL))
				$project -> organizations[] = $organization;
		}
		return $project;
	}

	// Parse a single person from a search service XML response.
	// xpath the DOMXPath to parse
	// return person (object)
	private function parsePerson($xpath) {
		if ((($resultsNodes = $xpath -> query('/response/results/record')) == FALSE) || (($resultNode = $resultsNodes -> item(0)) == NULL))
			throw new Exception('error parsing person');
		if (($lastNameNodes = $xpath -> query('./field[@name = "secondnames"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing person');
		if (($firstNameNodes = $xpath -> query('./field[@name = "firstname"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing person');
		if (($fullNameNodes = $xpath -> query('./field[@name = "fullname"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing person');
		if (($countryNodes = $xpath -> query('./field[@name = "nationalityname"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing person');
		$person = new JObject();
		$person -> lastName =  (($lastNameNode = $lastNameNodes -> item(0)) == NULL) ? NULL : trim($lastNameNode -> nodeValue);
		$person -> firstName = (($firstNameNode = $firstNameNodes -> item(0)) == NULL) ? NULL : trim($firstNameNode -> nodeValue);
		$person -> fullName = (($fullNameNode = $fullNameNodes -> item(0)) == NULL) ? NULL : trim($fullNameNode -> nodeValue);
		$person -> country = (($countryNode = $countryNodes -> item(0)) == NULL) ? NULL : trim($countryNode -> nodeValue);
		return $person;
	}
	
	// Parse a single organization from a search service XML response.
	// xpath the DOMXPath to parse
	// return organization (object)
	private function parseOrganization($xpath) {
		if ((($resultNodes = $xpath -> query('/response/results/result')) == FALSE) || (($resultNode = $resultNodes -> item(0)) == NULL))
			throw new Exception('error parsing organization');
		if (($shortNameNodes = $xpath -> query('./field[@name = "legalshortname"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing organization');
		if (($nameNodes = $xpath -> query('./field[@name = "legalname"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing organization');
		if (($urlNodes = $xpath -> query('./field[@name = "websiteurl"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing organization');
		if (($countryNodes = $xpath -> query('./field[@name = "countryname"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing organization');
		if (($projectNodes = $xpath -> query('./field[@name = "project"]', $resultNode)) == FALSE)
			throw new Exception('error parsing organization');
		$organization = new JObject();
		$organization -> shortName = (($shortNameNode = $shortNameNodes -> item(0)) == NULL) ? NULL : trim($shortNameNode -> nodeValue);
		$organization -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
		$organization -> url = (($urlNode = $urlNodes -> item(0)) == NULL) ? NULL : trim($urlNode -> nodeValue);
		$organization -> country = (($countryNode = $countryNodes -> item(0)) == NULL) ? NULL : trim($countryNode -> nodeValue);
		$organization -> projects = array();
		foreach ($projectNodes as $projectNode) {
			if (($idNodes = $xpath -> query('./field[@name = "projectId"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing organization');
			if (($acronymNodes = $xpath -> query('./field[@name = "projectacronym"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing organization');
			if (($titleNodes = $xpath -> query('./field[@name = "projecttitle"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing organization');
			if (($codeNodes = $xpath -> query('./field[@name = "projectcode"]/@value', $projectNode)) == FALSE)
				throw new Exception('error parsing organization');
			$project = new JObject();
			$project -> id = (($idNode = $idNodes -> item(0)) == NULL) ? NULL : trim($idNode -> nodeValue);
			$project -> acronym = (($acronymNode = $acronymNodes -> item(0)) == NULL) ? NULL : ((trim($acronymNode -> nodeValue) == self :: UNKNOWN) ? NULL : trim($acronymNode -> nodeValue));
			$project -> title = (($titleNode = $titleNodes -> item(0)) == NULL) ? NULL : trim($titleNode -> nodeValue);
			$project -> code = (($codeNode = $codeNodes -> item(0)) == NULL) ? NULL : trim($codeNode -> nodeValue);
			if (($project -> id != NULL) || ($project -> acronym != NULL) || ($project -> title != NULL) || ($project -> code != NULL))
				$organization -> projects[] = $project;
		}
		return $organization;
	}
	
	// Parse a single datasource from a search service XML response.
	// xpath the DOMXPath to parse
	// return datasource (object)
	private function parseDatasource($xpath) {
		if ((($resultsNodes = $xpath -> query('/response/results/result')) == FALSE) || (($resultNode = $resultsNodes -> item(0)) == NULL))
			throw new Exception('error parsing datasource');
		if (($nameNodes = $xpath -> query('./field[@name = "officialname"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing datasource');
		if (($englishNameNodes = $xpath -> query('./field[@name = "englishname"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing datasource');
		if (($urlNodes = $xpath -> query('./field[@name = "websiteurl"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing datasource');
		if (($logoNodes = $xpath -> query('./field[@name = "logourl"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing datasource');
		if (($typeNodes = $xpath -> query('./field[@name = "datasourcetypeuiid"]/@value', $resultNode)) == FALSE)
			throw new Exception('error pasrsing datasource');	
		if (($itemsNodes = $xpath -> query('./field[@name = "odnumberofitems"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing datasource');
		if (($dateNodes = $xpath -> query('./field[@name = "odnumberofitemsdate"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing datasource');
		if (($subjectsNodes = $xpath -> query('./field[@name = "odsubjects"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing datasource');
		if (($languagesNodes = $xpath -> query('./field[@name = "odlanguages"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing datasource');
		if (($contentsNodes = $xpath -> query('./field[@name = "odcontenttypes"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing datasource');
		if (($policiesNodes = $xpath -> query('./field[@name = "odpolicies"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing datasource');
		if (($compatibilityNodes = $xpath -> query('./field[@name = "openairecompatibilityid"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing datasource');
		if (($oaiPmhNodes = $xpath -> query('./field[@name = "accessinfopackage"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing datasources');
		if (($descriptionNodes = $xpath -> query('./field[@nam = "oddescription"]/@value', $resultNode)) == FALSE)
			throw new Exception('error parsing datasource');
		$datasource = new JObject();
		$datasource -> name = (($nameNode = $nameNodes -> item(0)) == NULL) ? NULL : trim($nameNode -> nodeValue);
		$datasource -> englishName = (($englishNameNode = $englishNameNodes -> item(0)) == NULL) ? NULL : trim($englishNameNode -> nodeValue);
		$datasource -> url = (($urlNode = $urlNodes -> item(0)) == NULL) ? NULL : trim($urlNode -> nodeValue);
		$datasource -> logo = (($logoNode = $logoNodes -> item(0)) == NULL) ? NULL : trim($logoNode -> nodeValue);
		$datasource -> type = (($typeNode = $typeNodes -> item(0)) == NULL) ? NULL : trim($typeNode -> nodeValue);
		$datasource -> items = (($itemsNode = $itemsNodes -> item(0)) == NULL) ? NULL : intval(trim($itemsNode -> nodeValue));
		$datasource -> date = (($dateNode = $dateNodes -> item(0)) == NULL) ? NULL : strtotime(trim($dateNode -> nodeValue));
		$datasource -> subjects = (($subjectsNode = $subjectsNodes -> item(0)) == NULL) ? NULL : trim($subjectsNode -> nodeValue);
 		$datasource -> languages = array();
                foreach($languagesNodes as $languageNode) {
                        if ((($language = trim($languageNode -> nodeValue)) != NULL) && ($language != self :: UNDETERMINED)) {
                                $datasource -> languages[] = $language;
                        }
                }
		$datasource -> contents = (($contentsNode = $contentsNodes -> item(0)) == NULL) ? NULL : trim($contentsNode -> nodeValue);
		$datasource -> policies = (($policiesNode = $policiesNodes -> item(0)) == NULL) ? NULL : trim($policiesNode -> nodeValue);
		$datasource -> compatibility = (($compatibilityNode = $compatibilityNodes -> item(0)) == NULL) ? NULL : trim($compatibilityNode -> nodeValue);
		$datasource -> oaiPmh = (($oaiPmhNode = $oaiPmhNodes -> item(0)) == NULL) ? NULL : trim($oaiPmhNode -> nodeValue);
		$datasource -> description = (($descriptionNode = $descriptionNodes -> item(0)) == NULL) ? NULL : trim($descriptionNode -> nodeValue);
		return $datasource;
	}
}