Polynomial Time Fragments of XPath with Variables

Variables are the distiguishing new feature of XPath 2.0 which permits to select n-tuples of nodes in trees. It is known that the Core of XPath 2.0 captures n-ary first-order (FO) queries modulo linear time transformations. In this paper, we distinguish a fragment of Core XPath 2.0 that remains FO-complete with respect to n-ary queries while enjoying polynomial-time query answering.

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Databases [cs.DB]

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https://inria.hal.science/inria-00135678

Submitted on : Wednesday, March 21, 2007-4:08:35 PM

Last modification on : Friday, May 17, 2024-4:32:06 PM

Long-term archiving on : Friday, September 21, 2012-12:40:46 PM

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inria-00135678 , version 1 (21-03-2007)

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HAL Id : inria-00135678 , version 1

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Emmanuel Filiot, Joachim Niehren, Jean-Marc Talbot, Sophie Tison. Polynomial Time Fragments of XPath with Variables. 26th ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, Jun 2007, Beijing, China. pp.205-214. ⟨inria-00135678⟩

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