{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T09:20:24Z","timestamp":1788340824446,"version":"build-2803163510"},"reference-count":0,"publisher":"IOS Press","isbn-type":[{"value":"9781643686813","type":"electronic"}],"license":[{"start":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T00:00:00Z","timestamp":1788220800000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,1]]},"abstract":"<jats:p>The Wikidata knowledge graph describes 121 million entities connected by 13 thousand different types of relations. It is edited by over 40 thousand active editors, and supports more than 350 natural languages. Relations are viewed as claims: Wikidata presents the relation shape(Earth,geoid) alongside shape(Earth,disk). Claims can be annotated with time, references, provenance and confidence, to name a handful of examples. Some claims one can find in Wikidata are ontological, for example that \u201cfictional human\u201d is a subclass of \u201cimaginary human\u201d, which is a subclass of \u201cimaginary character\u201d, which is a subclass of \u201cnon-existent entity\u201d, which is a subclass of \u201centity\u201d, which is an instance of \u201cvariable-order class\u201d, which is an instance of itself. This talk will introduce Wikidata as a unique challenge, and potentially a final frontier, for ontology. We will give an overview of the knowledge graph, its applications, its potential, and its ontological bricolage. We motivate the opportunities for work on ontological modelling that is understandable for (and serves to guide) its thousands of non-expert editors, enables reasoning at massive scale, and makes the lives of the ever-growing Wikidata community easier.<\/jats:p>","DOI":"10.3233\/faia260769","type":"book-chapter","created":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T08:47:20Z","timestamp":1788338840000},"source":"Crossref","is-referenced-by-count":0,"title":["Wikidata: The Final Frontier for Ontology?"],"prefix":"10.3233","author":[{"given":"Aidan","family":"Hogan","sequence":"first","affiliation":[{"name":"University of Chile and Millennium Institute for Foundational Research on Data (IMFD), Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"7437","container-title":["Frontiers in Artificial Intelligence and Applications","Formal Ontology in Information Systems"],"original-title":[],"link":[{"URL":"https:\/\/ebooks.iospress.nl\/pdf\/doi\/10.3233\/FAIA260769","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T08:47:21Z","timestamp":1788338841000},"score":1,"resource":{"primary":{"URL":"https:\/\/ebooks.iospress.nl\/doi\/10.3233\/FAIA260769"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,1]]},"ISBN":["9781643686813"],"references-count":0,"URL":"https:\/\/doi.org\/10.3233\/faia260769","relation":{},"ISSN":["0922-6389","1879-8314"],"issn-type":[{"value":"0922-6389","type":"print"},{"value":"1879-8314","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,1]]}}}