semantic web linked data ontology open data vocabulary ontology design patterns metadata ontologies semantics data dcat-ap_it semantic interoperability uri knowledge graph linked open data r2rml transparenza open goverment fair principles ecosystem events data format seminar machine learning artificial intellingence datasets tourism sustainable development goals dataspace environmentaldata opendata linkedopendata digital transformation cpsv-ap_it interoperability big data once-only principle w3c standards dcat-ap cultural heritage public contracts
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