oai-pmh.md

+What is OAI-PMH and where to find information?
+The Open Archives Initiative - Prototcol for Metadata Harvesting provides an application-independent interoperability framework. 
+The details can be found: 
+[http://www.openarchives.org] (http://www.openarchives.org/OAI/openarchivesprotocol.html)
+
+Useful online tool for validation:
+[https://validator.oaipmh.com/](https://validator.oaipmh.com/)