Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Narrowed Extended XPath I

  • Andrew Trotman
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_242

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

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    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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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.University of OtagoDunedinNew Zealand

Section editors and affiliations

  • Jaap Kamps
    • 1
  1. 1.University of AmsterdamAmsterdamThe Netherlands