https://w3id.org/framester/conceptnet5/data/en/polybius <https://w3id.org/framester/conceptnet5/schema/InstanceOf> <https://w3id.org/framester/conceptnet5/data/en/person> <https://w3id.org/framester/conceptnet5/data/en/scientist> <https://w3id.org/framester/conceptnet5/schema/dbpedia.knownFor> <https://w3id.org/framester/conceptnet5/data/en/roman_republic> risorse dalla linked data cloud