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XML Indexing

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Encyclopedia of Database Systems

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Definition

XML employs an ordered, tree-structured model for representing data. Queries in XML languages like XQuery employ twig queries to match relevant portions of data in an XML database. An XML Index is a data structure that is used to efficiently look up all matches of a fragment of the twig query, where some of the twig query fragment nodes may have been mapped to specific nodes in the XML database.

Historical Background

XML path indexing is related to the problem of join indexing in relational database systems [15] and path indexing in object-oriented database systems (see, e.g., [1,9]). These index structures assume that the schema is homogeneous and known; these assumptions do not hold in general for XML data. The DataGuide [7] was the first path index designed specifically for XML data, where the schema may be heterogeneous and may not even be known.

Foundations

Notation

An XML document dis a rooted, ordered, node-labeled tree, where (i) each node corresponds to an XML...

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Recommended Reading

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Author information

Authors and Affiliations

  1. AT&T Labs–Research, Florham Park, NJ, USA

    Xin Luna Dong & Divesh Srivastava

Authors
  1. Xin Luna Dong
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  2. Divesh Srivastava
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Editor information

Editors and Affiliations

  1. College of Computing, Georgia Institute of Technology, 266 Ferst Drive, 30332-0765, Atlanta, GA, USA

    LING LIU (Professor) (Professor)

  2. Database Research Group David R. Cheriton School of Computer Science, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada

    M. TAMER ÖZSU (Professor and Director, University Research Chair) (Professor and Director, University Research Chair)

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© 2009 Springer Science+Business Media, LLC

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Dong, X., Srivastava, D. (2009). XML Indexing. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_779

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