oai-pmh.md

@@ -21,4 +21,23 @@ To get the Details of a specific Resourse: Example [GetRequest](https://oer-repo
 
 As mentioned above, some implementaion are returning content-type as _text/xml_ like **invenio**, others like **edu-share** returning _application/xml_. So the client should be able to handle both!
 
-**oerhub.at** harvests the data with a perl-based daemon. The implementation is based from [OAI-Harvester 1.20]( https://metacpan.org/pod/Net::OAI::Harvester). The Perl modul expects _text/xml_ and supports the standard DC. So our module accepts also _application/xml_ and has a LOM-handler implemented. The tests are rewritten because the official CPAN Module has used Test-Servers which are switched off.
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+**oerhub.at** harvests the data with a perl-based daemon. The implementation is based from [OAI-Harvester 1.20]( https://metacpan.org/pod/Net::OAI::Harvester). The Perl modul expects _text/xml_ and supports the standard DC. So our module accepts also _application/xml_ and has a LOM-handler implemented. The tests are rewritten because the official CPAN Module has used Test-Servers which are switched off.
+
+## Required Elements
+- lom.general.title
+- lom.general.description
+- lom.lifecycle.contribute.role.value (=Author) and the Name in lom.lifecycle.contribute.centity.vcard or lom.lifecycle.contribue.entity.langstring
+- lom.technical.format (mime/types)
+- lom.rights.description (CC-BY)
+- lom.classification.taxonpath (Öfos)
+
+centity is a custom entity which is introduced by edu-share for vcard support (used by UIBK). The entity is the default one (used by TUGraz).
+For langstring the attribute xml:lang is used.
+```
+<lom:title>
+  <lom:langstring xml:lang="de">Wirtschaft integrativ verstehen</lom:langstring>
+</lom:title>
+<lom:description>
+  <lom:langstring xml:lang="de">Einführungsvortrag zum Masterstudiengang Accounting, Auditing and Taxation</lom:langstring>
+</lom:description>
+```
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