https://w3id.org/framester/conceptnet5/data/en/continental_shelf <https://w3id.org/framester/conceptnet5/schema/DerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/continental.a> <https://w3id.org/framester/conceptnet5/data/en/shelf.n> risorse dalla linked data cloud