Software
OAI-PMH is based on a client–server architecture, in which "harvesters" request information on updated records from "repositories". Requests for data can be based on a datestamp range, and can be restricted to named sets defined by the provider. Data providers are required to provide XML metadata in Dublin Core format, and may also provide it in other XML formats.
A number of software systems support the OAI-PMH, including Fedora, GNU EPrints from the University of Southampton, Open Journal Systems from the Public Knowledge Project, Desire2Learn, DSpace from MIT, HyperJournal from the University of Pisa, Primo, DigiTool, Rosetta and MetaLib from Ex Libris, DOOR from the eLab in Lugano, Switzerland, panFMP from the PANGAEA (data library), SimpleDL from Roaring Development, and jOAI.
Read more about this topic: Open Archives Initiative Protocol For Metadata Harvesting