https://w3id.org/framester/conceptnet5/data/en/intangible_artifact <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/non_agentive_artifact> <https://w3id.org/framester/conceptnet5/data/en/intangible_individual_object> risorse dalla linked data cloud