https://w3id.org/framester/conceptnet5/data/en/nonmetal <https://w3id.org/framester/conceptnet5/schema/HasA> <https://w3id.org/framester/conceptnet5/data/en/dull_appearance> <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/poor_conductor_of_heat> <https://w3id.org/framester/conceptnet5/data/en/usuall_brittle> <https://w3id.org/framester/conceptnet5/data/en/not_good_conductor_of_electricity> <https://w3id.org/framester/conceptnet5/schema/Synonym> <https://w3id.org/framester/conceptnet5/data/en/non_metallic_element> risorse dalla linked data cloud