On the Semantic Relationship between Datalog and Description Logics

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Markus Krötzsch, Sebastian Rudolph, Peter H. Schmitt

On the Semantic Relationship between Datalog and Description Logics

Abstract. Translations to (first-order) datalog have been used in a number of inferencing techniques for description logics (DLs), yet the relationship between the semantic expressivities of function-free Horn logic and DL is understood only poorly. Although Description Logic Programs (DLP) have been described as DLs in the “expressive intersection” of DL and datalog, it is unclear what an intersection of two syntactically incomparable logics is, even if both have a first-order logic semantics. In this work, we offer a characterisation for DL fragments that can be expressed, in a concrete sense, in datalog. We then determine the largest such fragment for the DL ALC, and provide an outlook on the extension of our methods to more expressive DLs.

Published at RR2010 (Conference paper)

Download PDF (last update: September 23 2010)

Citation details


This work gives an abridged account of the technical report The Largest DLP Possible, with some presentational issues improved.

You can also download the slides for the talk given at RR 2010.


Description logics, Rule languages