https://w3id.org/framester/conceptnet5/data/en/coal_mine <https://w3id.org/framester/conceptnet5/schema/AtLocation> <https://w3id.org/framester/conceptnet5/data/en/surface_of_earth> <https://w3id.org/framester/conceptnet5/schema/DerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/mine.n> <https://w3id.org/framester/conceptnet5/data/en/coal.n> risorse dalla linked data cloud