https://w3id.org/framester/conceptnet5/data/en/empty_set <https://w3id.org/framester/conceptnet5/schema/DefinedAs> <https://w3id.org/framester/conceptnet5/data/en/initial_object_in_category_of_set> <https://w3id.org/framester/conceptnet5/schema/DerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/empty.a> <https://w3id.org/framester/conceptnet5/data/en/set.n> <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/set> <https://w3id.org/framester/conceptnet5/data/en/inital_object> risorse dalla linked data cloud