These three options can be used in
dc_oai_*() functions as input to
oai_dc - OAI Dublin Core - As a minimum requirement for OAI-PMH compliance, metadata must be made available in the OAI Dublin Core format. For more information please see the OAI-PMH web site.
oai_datacite - OAI DataCite - This metadata format has been specifically established for the dissemination of DataCite records using OAI-PMH. In addition to the original DataCite metadata, this format contains several other elements describing the version of the metadata, whether it is of reference quality, and the registering datacentre. For more information about this format and its schema please see the Datacite OAI schema web site.
datacite - DataCite Direct - This metadata format contains only the original DataCite metadata without additions or alterations. Because there are multiple versions of DataCite metadata in the MDS, there is no one schema that they will all adhere to. Therefore the schema for this format does not exist and metadata will not validate against it. Please note that this format is not OAI-PMH version 2.0 compliant for the previously stated reasons.
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