TY - CHAP T1 - Description Logics T2 - Handbook of the History of Logic Y1 - 2014 A1 - Matthias Knorr A1 - Pascal Hitzler ED - Dov. M. Gabbay ED - John Woods ED - Jörg Siekmann JF - Handbook of the History of Logic PB - Elsevier VL - 9 ER - TY - CONF T1 - Recent Advances in Integrating OWL and Rules T2 - Web Reasoning and Rule Systems - 6th International Conference, RR 2012, Vienna, Austria, September 10-12, 2012. Proceedings Y1 - 2012 A1 - Matthias Knorr A1 - David Carral A1 - Pascal Hitzler A1 - Adila Krisnadhi A1 - Frederick Maier A1 - Cong Wang ED - Markus Krötzsch ED - Umberto Straccia KW - description logics KW - OWL KW - Rules AB - As part of the quest for a unifying logic for the Semantic Web Technology Stack, a central issue is finding suitable ways of integrating description logics based on the Web Ontology Language (OWL) with rule-based approaches based on logic programming. Such integration is difficult since naive approaches typically result in the violation of one or more desirable design principles. For example, while both OWL 2 DL and RIF Core (a dialect of the Rule Interchange Format RIF) are decidable, their naive union is not, unless carefully chosen syntactic restrictions are applied. We report on recent advances and ongoing work by the authors in integrating OWL and rulesWe take an OWL-centric perspective, which means that we take OWL 2 DL as a starting point and pursue the question of how features of rulebased formalisms can be added without jeopardizing decidability. We also report on incorporating the closed world assumption and on reasoning algorithms. This paper essentially serves as an entry point to the original papers, to which we will refer throughout, where detailed expositions of the results can be found. JF - Web Reasoning and Rule Systems - 6th International Conference, RR 2012, Vienna, Austria, September 10-12, 2012. Proceedings PB - Springer CY - Austria, Vienna VL - 7497 UR - http://dx.doi.org/10.1007/978-3-642-33203-6_20 ER - TY - CONF T1 - Reconciling OWL and Non-monotonic Rules for the Semantic Web T2 - ECAI 2012 - 20th European Conference on Artificial Intelligence. Including Prestigious Applications of Artificial Intelligence (PAIS-2012) System Demonstrations Track Y1 - 2012 A1 - Matthias Knorr A1 - Pascal Hitzler A1 - Frederick Maier ED - Luc De Raedt ED - Christian Bessière ED - Didier Dubois ED - Patrick Doherty ED - Paolo Frasconi ED - Fredrik Heintz ED - Peter J. F. Lucas AB -

We propose a description logic extending SROIQ (the description logic underlying OWL 2 DL) and at the same time encompassing some of the most prominent monotonic and nonmonotonic rule languages, in particular Datalog extended with the answer set semantics. Our proposal could be considered a substantial contribution towards fulfilling the quest for a unifying logic for the Semantic Web. As a case in point, two non-monotonic extensions of description logics considered to be of distinct expressiveness until now are covered in our proposal. In contrast to earlier such proposals, our language has the “look and feel” of a description logic and avoids hybrid or first-order syntaxes.

JF - ECAI 2012 - 20th European Conference on Artificial Intelligence. Including Prestigious Applications of Artificial Intelligence (PAIS-2012) System Demonstrations Track PB - IOS Press CY - Montpellier, France VL - 242 UR - http://dx.doi.org/10.3233/978-1-61499-098-7-474 ER - TY - JOUR T1 - Local Closed World Reasoning with Description Logics under the Well-Founded Semantics JF - Artificial Intelligence Y1 - 2011 A1 - Matthias Knorr A1 - José Júlio Alferes A1 - Pascal Hitzler KW - Description Logic KW - Knowledge representation KW - Logic Programming KW - Non-monotonic reasoning KW - Ontologies KW - Semantic Web AB -

An important question for the upcoming Semantic Web is how to best combine open world ontology languages, such as the OWL-based ones, with closed world rule-based languages. One of the most mature proposals for this combination is known as hybrid MKNF knowledge bases [52], and it is based on an adaptation of the Stable Model Semantics to knowledge bases consisting of ontology axioms and rules. In this paper we propose a well-founded semantics for nondisjunctive hybrid MKNF knowledge bases that promises to provide better efficiency of reasoning, and that is compatible with both the OWL-based semantics and the traditional Well-Founded Semantics for logic programs. Moreover, our proposal allows for the detection of inconsistencies, possibly occurring in tightly integrated ontology axioms and rules, with only little additional effort. We also identify tractable fragments of the resulting language.

VL - 175 UR - http://dx.doi.org/10.1016/j.artint.2011.01.007 IS - 9-10 ER -