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Consistency and Certain Answers in Relational to RDF Data Exchange with Shape Constraints

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New Trends in Databases and Information Systems (ADBIS 2020)

Part of the book series: Communications in Computer and Information Science ((CCIS,volume 1259))

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Abstract

We investigate the data exchange from relational databases to RDF graphs inspired by R2RML with the addition of target shape schemas capturing fragments of SHACL and ShEx. We study the problems of consistency i.e., checking that every source instance admits a solution, and certain query answering i.e., finding answers present in every solution. We identify the class of constructive relational to RDF data exchange that uses IRI constructors and full tgds (with no existential variables) in its source to target dependencies. We show that the consistency problem is coNP-complete. We introduce the notion of universal simulation solution that allows to compute certain query answers to any class of queries that is robust under simulation. One such class are nested regular expressions (NREs) that are forward i.e., do not use the inverse operation. Using universal simulation solution renders tractable the computation of certain answers to forward NREs (data-complexity).

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Notes

  1. 1.

    This was called absolute consistency in  [9].

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Authors and Affiliations

  1. Univ. Lille, CNRS, Centrale Lille, Inria, UMR 9189 - CRIStAL - Centre de Recherche en Informatique Signal et Automatique de Lille, 59000, Lille, France

    Iovka Boneva, Sławek Staworko & Jose Lozano

Authors
  1. Iovka Boneva
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  2. Sławek Staworko
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  3. Jose Lozano
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Corresponding author

Correspondence to Jose Lozano .

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Editors and Affiliations

  1. Université Lumière Lyon 2, Lyon, France

    Jérôme Darmont

  2. National Research University Higher School of Economics, St. Petersburg, Russia

    Boris Novikov

  3. Poznań University of Technology, Poznań, Poland

    Robert Wrembel

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Boneva, I., Staworko, S., Lozano, J. (2020). Consistency and Certain Answers in Relational to RDF Data Exchange with Shape Constraints. In: Darmont, J., Novikov, B., Wrembel, R. (eds) New Trends in Databases and Information Systems. ADBIS 2020. Communications in Computer and Information Science, vol 1259. Springer, Cham. https://doi.org/10.1007/978-3-030-54623-6_9

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  • DOI: https://doi.org/10.1007/978-3-030-54623-6_9

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-54622-9

  • Online ISBN: 978-3-030-54623-6

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