https://w3id.org/framester/conceptnet5/data/en/cdrom <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/compact_disc> <https://w3id.org/framester/conceptnet5/data/en/compact_disc_generic_type_by_writability> risorse dalla linked data cloud