Greenstone3 OAI repository 2.0 1970-01-01 persistent YYYY-MM-DDThh:mm:ssZ yes 7200 250 oai_dc http://www.openarchives.org/OAI/2.0/oai_dc.xsd http://www.openarchives.org/OAI/2.0/oai_dc/ edm http://www.europeana.eu/schemas/edm/EDM.xsd http://www.europeana.eu/schemas/edm/