https://w3id.org/framester/conceptnet5/data/en/sign_up <https://w3id.org/framester/conceptnet5/schema/DerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/sign.v> <https://w3id.org/framester/conceptnet5/schema/MotivatedByGoal> <https://w3id.org/framester/conceptnet5/data/en/take_exam> <https://w3id.org/framester/conceptnet5/data/en/take_course> risorse dalla linked data cloud