@namespace("eu.dnetlib.iis.metadataextraction.schemas")
protocol IIS{

	import idl "Affiliation.avdl";
	import idl "ReferenceBasicMetadata.avdl";
	import idl "ReferenceMetadata.avdl";
    
    record Author {
//      author name extracted from pdf document
        union { null , string } authorFullName = null;
//		position on affiliations list        
        union { null , array<int> } affiliationPositions = null;
    }
    
    record ExtractedDocumentMetadata {
//      ID of the document, foreign key: Document.id ("document" data store)
        string id;
                
//      moved from DocumentBasicMetadata        
//      title
        union { null , string } title = null;
//      abstract or description
        union { null , string } abstract = null;
        union { null , string } language = null;
//      list of keywords (free form)
        union { null , array<string> } keywords = null;
//      alternative identifier (e.g. internal publisher's identifiers)
        union { null , map<string> } externalIdentifiers = null;
//      name of journal in which the article is published
        union { null , string } journal = null;
//      year of publication
        union { null , int } year = null;
//      publisher name
        union { null , string } publisher = null;
//      end of: moved from DocumentBasicMetadata
        
//      references extracted from pfd document
        union { null , array<ReferenceMetadata> } references = null;
//      author names extracted from pdf document
//        union { null , array<string> } authorFullNames = null;
//		authors extracted from PDF document along with position of affiliations list
        union { null , array<Author> } authors = null;

//      affiliations extracted from PDF document
        union { null , array<Affiliation> } affiliations = null;
        
//      additional fields supplementing basicMetadata
//      journal volume in which the article is published
        union { null , string } volume = null;
//      journal issue in which the article is published
        union { null , string } issue = null;
//      page range in which the article is published
        union { null , Range } pages = null;
        
//      propagated from pmc ExtractedDocumentMetadata#entityType
		union { null , string } publicationTypeName = null;
    }

}