https://w3id.org/framester/conceptnet5/cla/la.absens <https://w3id.org/framester/conceptnet5/schema/RelatedTo> <https://w3id.org/framester/conceptnet5/data/en/miss> <https://w3id.org/framester/conceptnet5/data/en/absent> <https://w3id.org/framester/conceptnet5/data/en/absentia> risorse dalla linked data cloud