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 Open Archives Initiative - Prototcol for Metadata Harvesting provides an application-independent interoperability framework. An Interface must be able to return metadata manifestation as _Dublin Core_ format. Optionally, a repository may also disseminate other formats of metadata. In the Project Openeducation the _LOM_ format is used!
 
 The details can be found: 
 [http://www.openarchives.org](http://www.openarchives.org/OAI/openarchivesprotocol.html)
-
 ## Online Validation
 Useful online tool for validation:
 [https://validator.oaipmh.com/](https://validator.oaipmh.com/)
-> Hint: The Standard says "The Content-Type returned for all OAI-PMH requests **must** be _text/xml_." but the validator expect _application/xml_!
+> Hint: The Standard says "The **Content-Type returned** for all OAI-PMH requests **must** be _text/xml_." but the validator expect _application/xml_!
+## LOM
+The Learning Object Metadata is a data model, usually encoded in XML, used to describe a learning object and similar digital resources used to support learning.
+The [definition](https://oer-repo.uibk.ac.at/lom/latest/) used by UIBK
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