Open archive
Encyclopedia
An open archive is an institutional repository
Institutional repository
An Institutional repository is an online locus for collecting, preserving, and disseminating - in digital form - the intellectual output of an institution, particularly a research institution....

 or some other web-accessible digital database that is compliant with the Open Archives Initiative Protocol for Metadata Harvesting
Open Archives Initiative Protocol for Metadata Harvesting
OAI-PMH is a protocol developed by the Open Archives Initiative. 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...

(OAI-PMH).
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