Proc. of the 26th Int. Workshop on Description Logics (DL 2013). Volume 1014 of CEUR Workshop Proceedings, https://ceur-ws.org/. 2013.
In this paper we study the extension of description logics of the DL-Lite family with singleton nominals, which correspond in OWL 2 to the ObjectHasValue construct. Differently from arbitrary (non-singleton) nominals, which make query answering intractable in data complexity, we show that both knowledge base satisfiability and conjunctive query answering stay first-order rewritable when DL-LiteA is extended with singleton nominals. Our technique is based on a practically implementable algorithm based on rewriting rules, in the style of those implemented in current state-of-the-art OBDA systems based on DL-Lite, such as QuOnto and Quest. This allows us to follow the tradition of the DL-Lite family for employing relational database technology for query answering with optimal data complexity.
@inproceedings{DL-2013-nominals, title = "Extending DL-LiteA with (Singleton) Nominals", year = "2013", author = "Maxim G. Haddad and Diego Calvanese", booktitle = "Proc. of the 26th Int. Workshop on Description Logics (DL 2013)", pages = "704--723", volume = "1014", publisher = "CEUR-WS.org", series = "CEUR Workshop Proceedings, https://ceur-ws.org/", }pdf url