Extending DL-LiteA with (Singleton) Nominals

Maxim G. Haddad and Diego Calvanese

Proc. of the 26th Int. Workshop on Description Logics (DL 2013). Volume 1014 of CEUR Workshop Proceedings, http://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.

   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",
   series = "CEUR Workshop Proceedings, http://ceur-ws.org/",
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