Explanations for Inconsistency-Tolerant Query Answering under Existential Rules


  • Thomas Lukasiewicz University of Oxford
  • Enrico Malizia University of Exeter
  • Cristian Molinaro University of Calabria




Querying inconsistent knowledge bases is a problem that has attracted a great deal of interest over the last decades. While several semantics of query answering have been proposed, and their complexity is rather well-understood, little attention has been paid to the problem of explaining query answers. Explainability has recently become a prominent problem in different areas of AI. In particular, explaining query answers allows users to understand not only what is entailed by an inconsistent knowledge base, but also why. In this paper, we address the problem of explaining query answers for existential rules under three popular inconsistency-tolerant semantics, namely, the ABox repair, the intersection of repairs, and the intersection of closed repairs semantics. We provide a thorough complexity analysis for a wide range of existential rule languages and for different complexity measures.




How to Cite

Lukasiewicz, T., Malizia, E., & Molinaro, C. (2020). Explanations for Inconsistency-Tolerant Query Answering under Existential Rules. Proceedings of the AAAI Conference on Artificial Intelligence, 34(03), 2909-2916. https://doi.org/10.1609/aaai.v34i03.5682



AAAI Technical Track: Knowledge Representation and Reasoning