Complexity Boundaries for Horn Description Logics


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Markus Krötzsch, Sebastian Rudolph, Pascal Hitzler

Complexity Boundaries for Horn Description Logics

Abstract. Horn description logics (Horn-DLs) have recently started to attract attention due to the fact that their (worst-case) data complexities are in general lower than their overall (i.e. combined) complexities, which makes them attractive for reasoning with large ABoxes. However, the natural question whether Horn-DLs also provide advantages for TBox reasoning has hardly been addressed so far. In this paper, we therefore provide a thorough and comprehensive analysis of the combined complexities of Horn-DLs. While the combined complexity for many Horn-DLs turns out to be the same as for their non-Horn counterparts, we identify subboolean DLs where Hornness simplifies reasoning.

Published at AAAI2007 (Conference paper)

Download PDF (last update: August 22 2007)

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This paper is superseded by the article Complexities of Horn Description Logics. It is strongly recommended to refer to the latter, which has been thoroughly updated for improving clarity and presentation. It also includes some updated results and pointers to related works.


Description logics

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