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Unlocking Keys for XML Trees

  • Conference paper
Database Theory – ICDT 2007 (ICDT 2007)

Part of the book series: Lecture Notes in Computer Science ((LNISA,volume 4353))

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Abstract

We review key constraints in the context of XML as introduced by Buneman et al. We show that one of the proposed inference rules is not sound in general, and the axiomatisation proposed for XML keys is incomplete even if key paths are simple. Therefore, the axiomatisation and also the implication problem for XML keys are still unsolved.

We propose a set of inference rules that is indeed sound and complete for the implication of XML keys with simple key paths. Our completeness proof enables us to characterise the implication of XML keys in terms of the reachability problem of nodes in a digraph. This results in a quadratic time algorithm for deciding XML key implication, and shows that reasoning for XML keys is practically efficient.

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Author information

Authors and Affiliations

  1. Information Science Research Centre, Massey University, New Zealand

    Sven Hartmann & Sebastian Link

Authors
  1. Sven Hartmann
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Editor information

Editors and Affiliations

  1. Technical University of Dortmund,  

    Thomas Schwentick

  2. Department of Computer Science and Engineering, University of Washington,  

    Dan Suciu

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© 2006 Springer-Verlag Berlin Heidelberg

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Hartmann, S., Link, S. (2006). Unlocking Keys for XML Trees. In: Schwentick, T., Suciu, D. (eds) Database Theory – ICDT 2007. ICDT 2007. Lecture Notes in Computer Science, vol 4353. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11965893_8

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  • DOI: https://doi.org/10.1007/11965893_8

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-69269-0

  • Online ISBN: 978-3-540-69270-6

  • eBook Packages: Computer ScienceComputer Science (R0)

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