XQuery

Definition

Xquery is a query language that uses the structure of XML intelligently can express queries across all these kinds of data, whether physically stored in XML or viewed as XML via middleware. In other words, you can use it to retrieve things from files, from XML representations made from SQL databases, from native XML databases like exists. In addition, Xquery is quite a real programming language. XUpdate is a protocol to updated (XQuery can't). XML Databases are servers in which can plug XML "as is" and get it back with Xquery and/or XSLT.

Manuals

• XML:DB XUpdate Use Cases by Kimbro Staken. This document outlines a basic set of uses cases for the XUpdate specification from the XML:DB Initiative.

XQuery Tutorials

• Essential XQuery - The XML Query Language by Darshan Singh. (Feb 2, 2004). Good !
• An introduction to XQuery article for recent developments (2002, updated 2003).
• XQuery, tutorial by Anders M�ller & Michael I. Schwartzbach [2003]
• XQuery Tutorial from IPEDO. Quite technical.
• XQuery from the Experts: Influences on the design of XQuery Webreference Article, excerpt is from Chapter 2 of the Addison-Wesley book XQuery from the Experts. [2003]
• Michael Brundage (2004). XQuery: The XML Query Language, Portland: Book News [this is a good book]

Software

XML databases

See XML database

XQuery Engines

• XQuery Engines, Processors, Providers A list of products by SQL Summit.com

• ***SAXON XSLT and XQuery Processor INSTALLED and used as default XSLT engine at Tecfa: local documentation.
• XQEngine - XML Query Engine implements XQuery - sourceforge project.
• MXQuery. low-footprint, extensible XQuery Engine (Java). Includes support for update
• Safari Guide Safari Guide is a free application for Mac OS X Tiger that allows developers to evaluate arbitrary XPath and XQuery expressions against the current frontmost Safari webpage. [10/2005]

XML Editors with XQuery support

See XML editor for a list of XML editors

Many, e.g. XML Exchanger lite.

Links

• XML Database Products by Ronald Bourret