{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,5,4]],"date-time":"2025-05-04T00:03:05Z","timestamp":1746316985737},"publisher-location":"California","reference-count":0,"publisher":"International Joint Conferences on Artificial Intelligence Organization","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2021,9]]},"abstract":"<jats:p>Existential rules are a very popular ontology-mediated query language for which the chase represents a generic computational approach for query answering. It is straightforward that existential rule queries exhibiting chase termination are decidable and can only recognize properties that are preserved under homomorphisms. In this paper, we show the converse: every decidable query that is closed under homomorphism can be expressed by an existential rule set for which the standard chase universally terminates. Membership in this fragment is not decidable, but we show via a diagonalisation argument that this is unavoidable.<\/jats:p>","DOI":"10.24963\/kr.2021\/14","type":"proceedings-article","created":{"date-parts":[[2021,10,11]],"date-time":"2021-10-11T16:45:56Z","timestamp":1633970756000},"page":"141-150","source":"Crossref","is-referenced-by-count":4,"title":["Capturing Homomorphism-Closed Decidable Queries with Existential Rules"],"prefix":"10.24963","author":[{"given":"Camille","family":"Bourgaux","sequence":"first","affiliation":[{"name":"DIENS, ENS, CNRS, PSL University & Inria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"Carral","sequence":"additional","affiliation":[{"name":"LIRMM, Inria, University of Montpellier, CNRS"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Markus","family":"Kr\u00f6tzsch","sequence":"additional","affiliation":[{"name":"TU Dresden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sebastian","family":"Rudolph","sequence":"additional","affiliation":[{"name":"TU Dresden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Micha\u00ebl","family":"Thomazo","sequence":"additional","affiliation":[{"name":"Inria, DIENS, ENS, CNRS, PSL University"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"10584","event":{"number":"18","sponsor":["Artificial Intelligence Journal","Principles of Knowledge Representation and Reasoning Inc.","Sea AI Lab","Potassco Solutions","European Association for Artificial Intelligence"],"acronym":"KR-2021","name":"18th International Conference on Principles of Knowledge Representation and Reasoning {KR-2021}","start":{"date-parts":[[2020,11,12]]},"theme":"Artificial Intelligence","location":"Hanoii, Vietnam","end":{"date-parts":[[2021,11,18]]}},"container-title":["Proceedings of the Eighteenth International Conference on Principles of Knowledge Representation and Reasoning"],"original-title":[],"deposited":{"date-parts":[[2021,10,11]],"date-time":"2021-10-11T16:46:04Z","timestamp":1633970764000},"score":1,"resource":{"primary":{"URL":"https:\/\/proceedings.kr.org\/2021\/14"}},"subtitle":[],"proceedings-subject":"Artificial Intelligence Research Articles","short-title":[],"issued":{"date-parts":[[2021,9]]},"references-count":0,"URL":"https:\/\/doi.org\/10.24963\/kr.2021\/14","relation":{},"subject":[],"published":{"date-parts":[[2021,9]]}}}