https://w3id.org/framester/conceptnet5/data/en/paul_levinson <https://w3id.org/framester/conceptnet5/schema/InstanceOf> <https://w3id.org/framester/conceptnet5/data/en/author> <https://w3id.org/framester/conceptnet5/data/en/person> <https://w3id.org/framester/conceptnet5/data/en/professor> risorse dalla linked data cloud