2026-06-09T18:44:55Z https://oai.datacite.org/oai oai_dc http://www.openarchives.org/OAI/2.0/oai_dc.xsd http://www.openarchives.org/OAI/2.0/oai_dc/ oai_datacite http://schema.datacite.org/oai/oai-1.1/oai.xsd http://schema.datacite.org/oai/oai-1.1/ datacite http://schema.datacite.org/meta/nonexistant/nonexistant.xsd http://datacite.org/schema/nonexistant