Data Complexity of Query Answering in Description Logics


In this paper we study data complexity of answering conjunctive queries over DL knowledge bases constituted by an ABox and a TBox. In particular, we characterize the LogSpace boundary (over the data) of the problem. This boundary is particularly meaningful because, when we go above it, query answering is not expressible as a first-order logic formula (and hence an SQL query) over the data. Within the LogSpace boundary we essentially find DL-Lite, a simple DL that is rich enough to express the core of UML class diagrams. The second contribution of the paper is to establish coNP-hardness of query answering with respect to data complexity for various cases of surprisingly simple DLs.

DOI: 10.1016/j.artint.2012.10.003

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@article{Calvanese2005DataCO, title={Data Complexity of Query Answering in Description Logics}, author={Diego Calvanese and Giuseppe De Giacomo and Domenico Lembo and Maurizio Lenzerini and Riccardo Rosati}, journal={Artif. Intell.}, year={2005}, volume={195}, pages={335-360} }