materialize https://w3id.org/framester/pb/pbdata/materialize.01 <https://w3id.org/framester/pb/pbschema/RoleSet> rdfs:label xsd:string materialize rdf:type <https://w3id.org/framester/pb/pbschema/RoleSet> <https://w3id.org/framester/pb/pbschema/hasRole> <https://w3id.org/framester/pb/pbdata/materialize.01__1> <https://w3id.org/framester/pb/pbdata/materialize.01__LOC> risorse dalla linked data cloud