https://w3id.org/framester/conceptnet5/data/en/stratigraphy.n <https://w3id.org/framester/conceptnet5/schema/RelatedTo> <https://w3id.org/framester/conceptnet5/data/en/rock> <https://w3id.org/framester/conceptnet5/data/en/chronology> <https://w3id.org/framester/conceptnet5/data/en/layer> <https://w3id.org/framester/conceptnet5/data/en/stratification> risorse dalla linked data cloud