howl https://w3id.org/framester/pb/pbdata/howl.03 <https://w3id.org/framester/pb/pbschema/RoleSet> rdfs:label xsd:string howl rdf:type <https://w3id.org/framester/pb/pbschema/RoleSet> <https://w3id.org/framester/pb/pbschema/hasRole> <https://w3id.org/framester/pb/pbdata/howl.03__1> risorse dalla linked data cloud