Open Archives Initiative Protocol for Metadata Harvesting
The Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH) is a protocol developed for harvesting metadata descriptions of records in an archive so that services can be built using metadata from many archives. An implementation of OAI-PMH must support representing metadata in Dublin Core, but may also support additional representations.
Source: Wikipedia — Open Archives Initiative Protocol for Metadata Harvesting (CC BY-SA 4.0)