https://w3id.org/framester/conceptnet5/data/en/keep_up.v <https://w3id.org/framester/conceptnet5/schema/RelatedTo> <https://w3id.org/framester/conceptnet5/data/en/prevent> <https://w3id.org/framester/conceptnet5/data/en/preserve> <https://w3id.org/framester/conceptnet5/data/en/maintain> <https://w3id.org/framester/conceptnet5/data/en/deteriorate> risorse dalla linked data cloud