https://w3id.org/framester/conceptnet5/data/en/chalcogen <https://w3id.org/framester/conceptnet5/schema/DerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/chalco> <https://w3id.org/framester/conceptnet5/schema/EtymologicallyDerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/gen> <https://w3id.org/framester/conceptnet5/data/en/chalco> risorse dalla linked data cloud