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arXiv · 2003.04411

Containment of Simple Regular Path Queries

Diego Figueira·Adwait Godbole·S. Krishna·Wim Martens·Matthias Niewerth·Tina Trautner
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Abstract

Testing containment of queries is a fundamental reasoning task in knowledge representation. We study here the containment problem for Conjunctive Regular Path Queries (CRPQs), a navigational query language extensively used in ontology and graph database querying. While it is known that containment of CRPQs is expspace-complete in general, we focus here on severely restricted fragments, which are known to be highly relevant in practice according to several recent studies. We obtain a detailed overview of the complexity of the containment problem, depending on the features used in the regular expressions of the queries, with completeness results for np, pitwo, pspace or expspace.

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Diego Figueira, Adwait Godbole, S. Krishna, Wim Martens, Matthias Niewerth, Tina Trautner. 2020-03-09. Containment of Simple Regular Path Queries. https://arxiv.org/abs/2003.04411

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