@prefix rdf: . @prefix owl: . _:vb911669 rdf:type owl:Class ; owl:unionOf _:vb911671 . @prefix pwdr: . @prefix ns3: . _:vb911669 pwdr:describedby ns3:abstract . @prefix bibo: . _:vb911670 rdf:first bibo:Document ; rdf:rest rdf:nil ; pwdr:describedby ns3:abstract . _:vb911671 rdf:first bibo:Collection ; rdf:rest _:vb911670 ; pwdr:describedby ns3:abstract .