pledge https://w3id.org/framester/pb/pbdata/pledge.01 <https://w3id.org/framester/pb/pbschema/RoleSet> rdfs:label xsd:string pledge rdf:type <https://w3id.org/framester/pb/pbschema/RoleSet> <https://w3id.org/framester/pb/pbschema/hasRole> <https://w3id.org/framester/pb/pbdata/pledge.01__2> <https://w3id.org/framester/pb/pbdata/pledge.01__0> risorse dalla linked data cloud