Open Archives Initiative Protocol for Metadata Harvesting
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A protocol developed by the Open Arhives Initative. It is used to harvest the metadata descriptions of the records in an archive so that services can be built using metadata from many archives.
The protocol is usually just refered to as the OAI Protocol.
The current version is 2.0
THe OAI-PMH uses XML over HTTP.
A number of software systems support the OAI-PMH, including GNU EPrints from the University of Southampton and DSpace from MIT.