https://w3id.org/framester/conceptnet5/data/en/photoelasticity <https://w3id.org/framester/conceptnet5/schema/DerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/photo> <https://w3id.org/framester/conceptnet5/schema/EtymologicallyDerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/photo> <https://w3id.org/framester/conceptnet5/data/en/elasticity> risorse dalla linked data cloud