https://w3id.org/framester/conceptnet5/data/en/rocky_planetary_body <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/stone> <https://w3id.org/framester/conceptnet5/data/en/geography_topic> <https://w3id.org/framester/conceptnet5/data/en/solid_planetary_body> risorse dalla linked data cloud