DCAT export fixes

[0einstein0]

• schema: added identifiers in affiliations relation invenio-vocabularies#446

• serializer: updated subjects and affiliations links in dcat #1890

PersonOrOrg:

BEFORE

<dct:creator>
	<rdf:Description rdf:about="https://orcid.org/0000-0002-1825-0097">
		<rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Person"/>
		<foaf:name>Allen, Brandon</foaf:name>
		<foaf:givenName>Brandon</foaf:givenName>
		<foaf:familyName>Allen</foaf:familyName>
		<org:memberOf>
			<foaf:Organization>
				<foaf:name>European Organization for Nuclear Research</foaf:name>
			</foaf:Organization>
		</org:memberOf>
		<org:memberOf>
			<foaf:Organization>
				<foaf:name>University of Hawaii</foaf:name>
			</foaf:Organization>
		</org:memberOf>
	</rdf:Description>
</dct:creator>
<dct:creator>
<dcat:contactPoint>
	<rdf:Description rdf:about="https://orcid.org/0000-0002-2337-5273">
		<rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Individual"/>
		<vcard:fn>Peng, Jun</vcard:fn>
		<vcard:given-name>Jun</vcard:given-name>
		<vcard:family-name>Peng</vcard:family-name>
		<vcard:organization-name>University of Münster</vcard:organization-name>
		<vcard:organization-name>Munster Technological University</vcard:organization-name>
	</rdf:Description>
</dcat:contactPoint>
<citedcat:dataCurator>
	<rdf:Description>
		<dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string">edmo:5340</dct:identifier>
		<rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Organization"/>
		<foaf:name>Lithuanian Geological Survey</foaf:name>
	</rdf:Description>
</citedcat:dataCurator>

AFTER

<dct:creator>
	<rdf:Description rdf:about="https://orcid.org/0000-0002-1825-0097">
		<rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Person"/>
		<foaf:name>Allen, Brandon</foaf:name>
		<foaf:givenName>Brandon</foaf:givenName>
		<foaf:familyName>Allen</foaf:familyName>
		<org:memberOf>
			<foaf:Organization>
				<foaf:name>European Organization for Nuclear Research</foaf:name>
			</foaf:Organization>
		</org:memberOf>
		<org:memberOf>
			<foaf:Organization>
				<foaf:name>University of Hawaii</foaf:name>
			</foaf:Organization>
		</org:memberOf>
	</rdf:Description>
</dct:creator>
<dct:creator>
	<rdf:Description rdf:about="https://edmo.seadatanet.org/report/3333">
		<dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string">edmo:3333</dct:identifier>
		<rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Organization"/>
		<foaf:name>Korea Meteorological Administration</foaf:name>
	</rdf:Description>
</dct:creator>
<dct:creator>
	<rdf:Description rdf:about="https://ror.org/04d836q62">
		<rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Organization"/>
		<foaf:name>TU Wien</foaf:name>
	</rdf:Description>
</dct:creator>
<dcat:contactPoint>
	<rdf:Description rdf:about="https://orcid.org/0000-0002-2337-5273">
		<rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Individual"/>
		<vcard:fn>Peng, Jun</vcard:fn>
		<vcard:given-name>Jun</vcard:given-name>
		<vcard:family-name>Peng</vcard:family-name>
		<vcard:organization-name>University of Münster</vcard:organization-name>
		<vcard:organization-name>Munster Technological University</vcard:organization-name>
	</rdf:Description>
</dcat:contactPoint>
<citedcat:dataCurator>
	<rdf:Description>
		<dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string">edmo:5340</dct:identifier>
		<rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Organization"/>
		<foaf:name>Lithuanian Geological Survey</foaf:name>
	</rdf:Description>
</citedcat:dataCurator>

Subjects:

BEFORE

<dct:subject>
	<skos:Concept>
		<skos:prefLabel>Geometry</skos:prefLabel>
		<skos:inScheme>
			<skos:ConceptScheme>
				<dct:title>EuroSciVoc</dct:title>
			</skos:ConceptScheme>
		</skos:inScheme>
	</skos:Concept>
</dct:subject>
<dct:subject>
	<skos:Concept>
		<skos:prefLabel>Iodine</skos:prefLabel>
		<skos:inScheme>
			<skos:ConceptScheme>
				<dct:title>GEMET</dct:title>
			</skos:ConceptScheme>
		</skos:inScheme>
	</skos:Concept>
</dct:subject>
<dct:subject>
	<skos:Concept>
		<skos:prefLabel>AMSSedAge</skos:prefLabel>
		<skos:inScheme>
			<skos:ConceptScheme>
				<dct:title>BODC-PUV</dct:title>
			</skos:ConceptScheme>
		</skos:inScheme>
	</skos:Concept>
</dct:subject>

AFTER

<dct:subject rdf:about="http://data.europa.eu/8mn/euroscivoc/33efa520-dc3d-4898-905e-1c0016d1d6eb">
	<skos:Concept>
		<skos:prefLabel>Geometry</skos:prefLabel>
		<skos:inScheme>
			<skos:ConceptScheme>
				<dct:title>EuroSciVoc</dct:title>
			</skos:ConceptScheme>
		</skos:inScheme>
	</skos:Concept>
</dct:subject>
<dct:subject rdf:about="http://www.eionet.europa.eu/gemet/concept/4483">
	<skos:Concept>
		<skos:prefLabel>Iodine</skos:prefLabel>
		<skos:inScheme>
			<skos:ConceptScheme>
				<dct:title>GEMET</dct:title>
			</skos:ConceptScheme>
		</skos:inScheme>
	</skos:Concept>
</dct:subject>
<dct:subject rdf:about="http://vocab.nerc.ac.uk/collection/P01/current/SAGEMSFM/">
	<skos:Concept>
		<skos:prefLabel>AMSSedAge</skos:prefLabel>
		<skos:inScheme>
			<skos:ConceptScheme>
				<dct:title>BODC-PUV</dct:title>
			</skos:ConceptScheme>
		</skos:inScheme>
		<skos:definition>Accelerated mass spectrometry on picked tests</skos:definition>
	</skos:Concept>
</dct:subject>