Answering Path Queries under Linear and Guarded Existential Rules
Ontology-mediated query answering is concerned with the problem of answering queries over knowledge bases consisting of a database instance and an ontology. While most work in the area focuses on conjunctive queries (CQs), navigational queries have gained increasing attention. In this paper, we investigate the complexity of answering two-way (conjunctive) regular path queries ((C)RPQs) over knowledge bases whose ontology is given by a set of guarded existential rules. We first consider the subclass of linear existential rules and show that (C)RPQ answering is NL-complete in data complexity, which matches the data complexity of answering RPQs over plain graph databases (i.e., without an on...
| Authors | Jean-François Baget, Meghyn Bienvenu, Marie-Laure Mugnier et al. |
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| Primary category | cs.AI |
| Published | 22 June 2026 |
| Last updated at source | 24 September 2026 |
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