https://w3id.org/framester/conceptnet5/data/en/voluntary <https://w3id.org/framester/conceptnet5/schema/DefinedAs> <https://w3id.org/framester/conceptnet5/data/en/opposite_of_mandatory> <https://w3id.org/framester/conceptnet5/schema/DerivedFrom> <https://w3id.org/framester/conceptnet5/cla/frm.voluntaire.a> <https://w3id.org/framester/conceptnet5/schema/EtymologicallyDerivedFrom> <https://w3id.org/framester/conceptnet5/cla/fro.volontaire> <https://w3id.org/framester/conceptnet5/data/en/volens> risorse dalla linked data cloud