The OAI-PMH publisher is not currently supporting incremental harvesting. Although the usage of the OAI parameters 'from' and 'until' is handled by the OAI publisher, the datestamps of metadata records are updated about every week. We apologise for any inconvenience this may cause to harvesters, the OpenAIRE technical team. OAI-PMH is a standard protocol for metadata publishing and harvesting. For details on the OAI-PMH protocol please refer to the official documentation at The OpenAIRE OAI-PMH endpoint is For information about the endpoint check The updated list of OAI sets is always available at: For quick reference, we report some of the likely more interesting sets: openaire: the set of publications. Metadata prefixes available: oaf, oai_dc FP7Publications: the set of publications funded by EC FP7. Metadata prefixes available: oaf, oai_dc H2020Publications: the set of publications funded by EC H2020. Metadata prefixes available: oaf, oai_dc openaire_data: the set of datasets. Metadata prefixes available: oaf, oai_datacite OpenAccess: the set of all Open Access publications and datasets. Metadata prefixes available: oaf (return datasets and publications), oai_dc (return datasets and publications), oai_datacite (return datasets only) projects: the set of all projects. Metadata prefix available: oaf ECProjects: the set of projects funded by the European Commission (EC) under the programmes FP7 and H2020. Metadata prefix available: oaf FP7Projects: the set of projects funded by the EC Seventh Framework Programme. Metadata prefix available: oaf H2020Projects: the set of projects funded by the EC Horizn 2020 Programme. Metadata prefix available: oaf WTProjects: the set of projects funded by Wellcome Trust. Metadata prefix available: oaf For the list of available metadata prefixes, check: . Note that records will always be available in the OpenAIRE format (schema, documentation). The availability of records in oai_dc and oai_datacite depends on the typology of records. Publications are avaialble in oai_dc according to the OpenAIRE3.0 guidelines for literature repositories. Datasets are available in oai_datacite according to the OpenAIRE2.0 guidelines for data archives.