https://w3id.org/framester/conceptnet5/data/en/dock_worker <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/low_middle_class> <https://w3id.org/framester/conceptnet5/data/en/unskilled_worker> risorse dalla linked data cloud