As of v6.6, it is now possible to harvest metadata directly from DataCite. Their OAI gateway (https://oai.datacite.org/oai) serves records for every DOI they have registered. Therefore, it is now possible to harvest metadata from any participating institution even if they do not maintain an OAI server of their own. Their OAI implementation offers a concept of a "dynamic set", making it possible to use any query supported by the DataCite search API as though it were a "set". This makes harvesting from them extra flexible, allowing to harvest virtually any arbitrary subset of metadata records, potentially spanning multiple institutions and registration authorities.
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