@prefix gbv: <http://purl.org/ontology/gbv/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .

gbv:ppn a rdfs:Datatype ;
	rdfs:comment "A PPN in general identifies a record in a PICA database, but it does not indicate which database it comes from."@en ;
	rdfs:isDefinedBy <http://purl.org/ontology/gbv/> ;
	rdfs:label "PPN identifier"@en .