https://w3id.org/framester/conceptnet5/data/en/preservative <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/food_ingredient> <https://w3id.org/framester/conceptnet5/schema/UsedFor> <https://w3id.org/framester/conceptnet5/data/en/have_sex> risorse dalla linked data cloud