GFZ Data Services uses the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH) which enable exposure and harvesting of repository metadata in Dublin Core, DataCite, ISO19115/19139 and NASA GCMD Directory Interchange Format (DIF) standards. It is further possible to harvest subsets of metadata based on the search parameters. For more information, please visit http://doidb.wdc-terra.org/oaip/