Revise to make the output compliant with the DCAT-AP 2.0.1 and GeoDCAT-AP 2.0.0 SHACL definitions, by adding the classes of all subjects and objects in the output RDF statements - see https://github.com/SEMICeu/iso-19139-to-dcat-ap/issues/22.
Fix syntax errors, concerning the use of @rdf:resource instead of @rdf:about for responsible parties.
@rdf:resource
instead of@rdf:about
for responsible parties.