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Containment of Simple Regular Path Queries

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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https://hal.archives-ouvertes.fr/hal-02505244
Contributor : Diego Figueira <>
Submitted on : Wednesday, March 11, 2020 - 1:02:48 PM
Last modification on : Thursday, March 12, 2020 - 1:41:52 AM

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  • HAL Id : hal-02505244, version 1
  • ARXIV : 2003.04411

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Diego Figueira, Adwait Godbole, S. Krishna, Wim Martens, Matthias Niewerth, et al.. Containment of Simple Regular Path Queries. 2020. ⟨hal-02505244⟩

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