issues with parsing DC rdf/xml records

[pvgenuchten]

I noticed some unexpected parsing issues when parsing DC rdf/xml files

• dc:identifer is not always populated; which leads to a db error indicating identifier is non nillable; suggestion here is to use the identifier of the record rdf:about='{id}' as alternate identifier
• DC and DCTERMS have some duplicate terms (title, description, language format, date), which in the ontology are replaceable, i wonder if the parser would pick it up, my impression is not
• in many cases dc:description is used in stead of dct:abstract
• contacts property on record is not populated for creator, publisher, ...
• links property on record is not populated from relation, source, ...

[tomkralidis]

@pvgenuchten can you provide some sample/test case metadata so I can reproduce?

[pvgenuchten]

• https://datacatalogue.cessda.eu/oai-pmh/v0/oai?verb=GetRecord&metadataPrefix=oai_dc&identifier=e97d29a96d0e4943d757efa95101a2904826065d947740f1fb05fe6e2a0930d5
• https://datacatalogue.cessda.eu/oai-pmh/v0/oai?verb=GetRecord&metadataPrefix=oai_dc&identifier=53b3946ddb431037aa99e4fccd86fe280a18b25e8ff9612e0f963ba0f2691e4e
• https://api.ka3.uni-koeln.de/oai/lac?identifier=hdl:11341/0000-0000-0000-35E2&verb=GetRecord&metadataPrefix=oai_dc
• https://textgridlab.org/1.0/tgoaipmh/oai?verb=GetRecord&metadataPrefix=oai_dc&identifier=textgrid:jgtr.0

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