stalk https://w3id.org/framester/pb/pbdata/stalk.02 <https://w3id.org/framester/pb/pbschema/RoleSet> rdfs:label xsd:string stalk rdf:type <https://w3id.org/framester/pb/pbschema/RoleSet> <https://w3id.org/framester/pb/pbschema/hasRole> <https://w3id.org/framester/pb/pbdata/stalk.02__0> <https://w3id.org/framester/pb/pbdata/stalk.02__1> risorse dalla linked data cloud