2026-10-24T01:21:45Z https://oai-pmh.ethmigsurveydatahub.eu/oai oai_dc http://www.openarchives.org/OAI/2.0/oai_dc.xsd http://www.openarchives.org/OAI/2.0/oai_dc/ ddi_c http://www.ddialliance.org/Specification/DDI-Codebook/2.5/XMLSchema/codebook.xsd ddi:codebook:2_5 ead3 http://www.loc.gov/ead/ead3.xsd http://ead3.archivists.org/schema/ oai_ddi25 http://www.ddialliance.org/Specification/DDI-Codebook/2.5/XMLSchema/codebook.xsd ddi:codebook:2_5 oai_datacite http://schema.datacite.org/meta/kernel-3/metadata.xsd http://datacite.org/schema/kernel-3