Horn-Rewritability vs PTime Query Evaluation in Ontology-Mediated Querying
Abstract
In ontology-mediated querying with an expressive description logic L, two desirable properties of a TBox T are (1) being able to replace T with a TBox formulated in the Horn-fragment of L without affecting the answers to conjunctive queries, and (2) that every conjunctive query can be evaluated in PTime w.r.t. T. We investigate in which cases (1) and (2) are equivalent, finding that the answer depends on whether the unique name assumption (UNA) is made, on the description logic under consideration, and on the nesting depth of quantifiers in the TBox. We also clarify the relationship between query evaluation with and without UNA and consider natural variations of property (1).
Cite
Text
Hernich et al. "Horn-Rewritability vs PTime Query Evaluation in Ontology-Mediated Querying." International Joint Conference on Artificial Intelligence, 2018. doi:10.24963/IJCAI.2018/257Markdown
[Hernich et al. "Horn-Rewritability vs PTime Query Evaluation in Ontology-Mediated Querying." International Joint Conference on Artificial Intelligence, 2018.](https://mlanthology.org/ijcai/2018/hernich2018ijcai-horn/) doi:10.24963/IJCAI.2018/257BibTeX
@inproceedings{hernich2018ijcai-horn,
title = {{Horn-Rewritability vs PTime Query Evaluation in Ontology-Mediated Querying}},
author = {Hernich, André and Lutz, Carsten and Papacchini, Fabio and Wolter, Frank},
booktitle = {International Joint Conference on Artificial Intelligence},
year = {2018},
pages = {1861-1867},
doi = {10.24963/IJCAI.2018/257},
url = {https://mlanthology.org/ijcai/2018/hernich2018ijcai-horn/}
}