Metadata harvesting is the automated collection of metadata descriptions from different sources to create useful aggregations of metadata and related services. The Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH), which uses XML over HTTP to exchange data on the World Wide Web, was introduced in 2001. OAI-PMH is widely used by digital libraries, institutional repositories, and digital archives, as well as commercial services, to facilitate data exchange among systems and expand access to collections.
A few common examples of aggregators using OAI-PMH:
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