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Narrowed Extended XPath I

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Encyclopedia of Database Systems

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Synonyms

NEXI

Definition

NEXI is an information retrieval (IR) query language for searching structured and semi-structured document collections. The language was first introduced for searching XML documents at the annual INEX [3] evaluation forum in 2004, and it was used extensively by INEX for its element retrieval and XML-IR experiments.

Designed as the simplest query language that could possibly work, the language is a tiny subset of XPath 1.0 [1] with an added about() function for identifying elements about some given topic. The language has extensions for question answering, multimedia searching, and searching heterogeneous document collections. NEXI is a language with a strict syntax defined in YACC but it has no semantics; the interpretation of the query is the task of the search engine.

Historical Background

A common information retrieval query language for searching collections of XML documents was needed for specifying the queries at the first INEX in 2002. There, XML markup...

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Recommended Reading

  1. Clark J, DeRose S. XML path language (XPath) 1.0, W3C recommendation. The World Wide Web Consortium. Available at: http://www.w3.org/TR/xpath 1999.

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Author information

Authors and Affiliations

  1. University of Otago, Dunedin, New Zealand

    Andrew Trotman

Authors
  1. Andrew Trotman
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Corresponding author

Correspondence to Andrew Trotman .

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. University of Amsterdam, Amsterdam, The Netherlands

    Jaap Kamps

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Trotman, A. (2018). Narrowed Extended XPath I. 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_242

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