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Encyclopedia of Database Systems pp 4807–4810Cite as

XML Tree Pattern, XML Twig Query

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Synonyms

TP; TPQ; Tree pattern queries; Twigs

Definition

A tree pattern query (also known as twig query) is a pair Q = (T, F), where T is node-labeled and edge-labeled tree with a distinguished node x ∈ T and F is a boolean combination of constraints on nodes. Node labels are variables such as $x, $y. Edge labels are one of “pc,” “ad,” indicating parent–child or ancestor–descendant. Node constraints are of the form $x.tag = TagName or $x.data relOp val, where $x.data denotes the data content of node $x, and relOp is one of =, <, >, ≤, ≥, ≠.

Informally, a tree pattern query specifies a pattern tree, with a set of constraints. Some of the constraints specify what the node labels (tags) should be. Some of them specify how pairs of nodes are related to one another – as a parent–child or as an ancestor–descendant. Finally, constraints on the data content of nodes enforce what data values are expected to be present at the nodes. Taken together, a tree pattern is similar in concept to a...

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Author information

Authors and Affiliations

  1. University of British Columbia, Vancouver, BC, Canada

    Laks V. S. Lakshmanan

Authors
  1. Laks V. S. Lakshmanan
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Correspondence to Laks V. S. Lakshmanan .

Editor information

Editors and Affiliations

  1. Georgia Institute of Technology College of Computing, Atlanta, GA, USA

    Ling Liu

  2. University of Waterloo School of Computer Science, Waterloo, ON, Canada

    M. Tamer Özsu

Section Editor information

  1. Laboratoire d'Informatique de Grenoble, CNRS and LIG, Grenoble, France

    Sihem Amer-Yahia

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Lakshmanan, L.V.S. (2018). XML Tree Pattern, XML Twig Query. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_797

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