https://w3id.org/framester/conceptnet5/data/en/union_of_mass_spatial_quantity <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/physical_measurable_quantity> <https://w3id.org/framester/conceptnet5/data/en/measurable_quantity> risorse dalla linked data cloud