https://w3id.org/framester/conceptnet5/data/en/elliptical_curve <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/manifold> <https://w3id.org/framester/conceptnet5/data/en/line_segment_planar> <https://w3id.org/framester/conceptnet5/data/en/one_dimensional_thing> risorse dalla linked data cloud