The Wayback Machine - https://web.archive.org/web/20170711201255/https://www.datacite.org/oaipmh.html

OAI-PMH

service description

This DataCite service exposes metadata held in the DataCite Metadata Store (MDS) using the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH).

OAI-PMH is a protocol developed for harvesting metadata descriptions of records. Every implementation of OAI-PMH supports representing metadata in Dublin Core, but DataCite's service also supports OAI DataCite and the original DataCite Metadata Schema used to deposit the record.