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Web Developer Resource Index: XQuery

XQuery is a language for extracting data from XML sources. This is similar in concept to how SQL is designed to retrieve data in a RDBMS. However, XQuery uses XPath expressions to traverse the tree structure of an XML document, rather than the SQL model based on rows and columns of data stored in tables that are related.

The root of any XQuery expression is the doc() function used to open an XML document. If this application was stored as XML (which it isn’t, I’m using MySQL at the moment), a possible query to match one record on this page might look like:

And would theoretically return An Introduction to XQuery.

If you have some experience with SQL, you should be able to see that this is a very simple example that selects a single record. XQuery uses more powerful expressions known as FLWOR, which are the equivalent of the SQL SELECT FROM HAVING WHERE model.

It is beyond the scope of this brief introduction to delve into any additional discussion of XQuery. Consult the resources below for more information.

Updated: Wednesday, August 17th, 2005 @ 11:35 PM EDT [16]

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Resources

• 1.XQuery 1.0: An XML Query Language

  This specification describes a query language called XQuery, which is designed to be broadly applicable across many types of XML data sources. [208]

  ★★★★☆
  URI:http://w3.org/TR/xquery/
  Author:
  XML Query Working Group
  [2]
  Reviewed:Monday, April 11th, 2005 @ 10:43 PM EDT
  by:
  Douglas Clifton
  
  XQuery 1.0: An XML Query Language specw3cxmlxquery
   

• 2.Berkeley DB XML

  An XML database engine which provides XQuery access into a database of document containers. XML documents are stored and indexed in their native format using Berkeley DB as the transactional engine. Not a client/server DBMS, rather a C++ access library. [1495]

  ★★★★☆
  URI:http://sleepycat.com/products/xml.shtml
  Author:
  Sleepcat Software
  [1]
  Reviewed:Wednesday, August 17th, 2005 @ 11:35 PM EDT
  by:
  Douglas Clifton
  
  Berkeley DB XML databaseopen sourcexmlxquery
   

• 3.XQuery Tools

  An integrated development environment (IDE) for developing XQuery-based applications. Includes an XQuery editor, mapper, debugger, profiler, an embedded Java API, and support for Saxon, XDMS, Mark Logic and the SleepCat Berkeley open-source XML databases. [1494]

  ★★★★☆
  URI:http://stylusstudio.com/xquery.html
  Author:
  Stylus Studio
  [1]
  Reviewed:Wednesday, August 17th, 2005 @ 10:29 PM EDT
  by:
  Douglas Clifton
  
  XQuery Tools apidatabaseideopen sourcexmlxquery
   

• 4.eXist: Open Source Native XML Database

  eXist is an Open Source native XML database featuring efficient, index-based XQuery processing, automatic indexing, extensions for full-text search, XUpdate support and tight integration with existing XML development tools. [1116]

  ★★★★☆
  URI:http://exist-db.org/
  Author:
  Wolfgang Meier
  [1]
  Reviewed:Monday, May 9th, 2005 @ 5:53 AM EDT
  by:
  Douglas Clifton
  
  eXist: Open Source Native XML Database databaseopen sourcexmlxquery
   

• 5.W3Schools: XQuery Tutorial

  The best way to describe XQuery is to say that XQuery is to XML what SQL is to database tables. [213]

  ★★★★☆
  URI:http://www.w3schools.com/xquery/
  Author:
  Jan Egil Refsnes
  [5]
  Reviewed:Monday, April 11th, 2005 @ 11:59 PM EDT
  by:
  Douglas Clifton
  
  W3Schools: XQuery Tutorial xquery
   

• 6.xquery.com

  Information and help for XQuery developers. Includes mailing lists, original content, a Wiki, and other material. [212]

  ★★★★☆
  URI:http://www.xquery.com/
  Author:
  Jason Hunter
  [1]
  Reviewed:Monday, April 11th, 2005 @ 11:56 PM EDT
  by:
  Douglas Clifton
  
  xquery.com wikixquery
   

• 7.An Introduction to XQuery

  This article provides some background history, a road map into the W3C XQuery documentation, and an overview of some of the technical issues involved in the specification. [211]

  ★★★★☆
  URI:http://www-106.ibm.com/developerworks/xml/library/x-xquery.html
  Author:
  Howard Katz
  [1]
  Reviewed:Monday, April 11th, 2005 @ 11:18 PM EDT
  by:
  Douglas Clifton
  
  An Introduction to XQuery specxquery
   

• 8.Essential XQuery: The XML Query Language

  XQuery or XML Query Language is a W3C specification designed to provide a flexible and standardized way of searching through (semi-structured) data that is either physically stored as XML or virtualized as XML. [210]

  ★★★★☆
  URI:http://www.yukonxml.com/articles/xquery/
  Author:
  Darshan Singh
  [1]
  Reviewed:Monday, April 11th, 2005 @ 11:10 PM EDT
  by:
  Douglas Clifton
  
  Essential XQuery: The XML Query Language xmlxquery
   

• 9.XQuery Working Group Collaboration Page

  The mission of the XML Query project is to provide flexible query facilities to extract data from real and virtual documents on the World Wide Web, thereby finally providing the needed interaction between the Web world and the database world. [209]

  ★★★★☆
  URI:http://w3.org/XML/Query
  Author:
  XML Query Working Group
  [2]
  Reviewed:Monday, April 11th, 2005 @ 10:49 PM EDT
  by:
  Douglas Clifton
  
  XQuery Working Group Collaboration Page databasew3cwwwxmlxquery
   

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Last updated: Wednesday, August 17th, 2005 @ 11:35 PM EDT [2005-08-18T03:35:53Z]