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Process XML using XQuery

Learn to more easily and naturally search your XML data with XQuery 1.0

Nicholas Chase (nicholas@nicholaschase.com), Author

Nicholas Chase has been involved in Web site development for companies such as Lucent Technologies, Sun Microsystems, Oracle, and the Tampa Bay Buccaneers. Nick has been a high school physics teacher, a low-level radioactive waste facility manager, an online science fiction magazine editor, a multimedia engineer, and an Oracle instructor. More recently, he was the Chief Technology Officer of Site Dynamics Interactive Communications in Clearwater, Florida, USA, and is the author of three books on Web development, including Java and XML From Scratch (Que) and the upcoming Primer Plus XML Programming (Sams). He loves to hear from readers and can be reached at nicholas@nicholaschase.com.

Summary: For years developers have used SQL to retrieve data from structured sources such as relational databases. But what about unstructured and semi-structured sources, such as XML data? To be viable as a data source, XML needed a means to conveniently retrieve the data. XQuery provides this means, allowing developers to write a statement that both extracts data and (if necessary) structures the results as XML. This tutorial shows you how to use XQuery to retrieve information from an XML document stored in an XQuery-enabled database. It also explains the ways in which XPath changes with version 2.0, and what those changes mean for data management.

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Date: 27 Mar 2007 (Published 24 Sep 2002)
Level: Intermediate
PDF: A4 and Letter (766 KB | 39 pages)Get Adobe® Reader®

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Resources

Learn

Get an overview of XQuery 1.0 with the introduction document from the W3C, XQuery 1.0: An XML Query Language.
Understand the changes to XPath with XML Path Language (XPath) 2.0 by reading What's New in XPath 2.0.
Read about the XQuery 1.0 and XPath 2.0 Data Model to understand how they interact.
See the new functions available in XQuery 1.0 and XPath 2.0 Functions and Operators.
See XQuery in action by looking at a thorough series of XML Query Use Cases.
Read about XML Syntax for XQuery 1.0 (XQueryX).
Read Howard Katz's article, An introduction to XQuery (developerWorks, updated January 2006). Howard is also the author of the Fatdog XQuery implementation.
Find more XML resources on the developerWorks XML technology zone.
Visit the XML technical library on the developerWorks XML Zone for a wide range of technical articles and tips, tutorials, standards, and IBM Redbooks.
Find out how you can become an IBM Certified Developer in XML and related technologies.
Stay current with developerWorks technical events and Webcasts.
Learn about Using XPath with the IBM Workplace data access tool (Mark Wallace, developerWorks, April 2005).
Read Practical data binding: XPath as data binding tool, Part 1 (Brett McLaughlin, developerWorks, November 2005) to learn how to use XPath to select portions of an XML document.
You can get a good look at what's coming with Working XML: Get started with XPath 2.0 (Benoît Marchal, developerWorks, May 2006).

Get products and technologies

Download the XML Query engine used in the tutorial at http://www.fatdog.com/.
Although it deals with XSLT rather than XQuery, Saxon 7 includes support for XPath 2.0. Download it at http://saxon.sourceforge.net.
Build your next development project with IBM trial software, available for download directly from developerWorks.
Download a trial version of DB2 9: DB2 Enterprise 9 or DB2 Express-C 9, a no-charge version of the DB2 Express 9 data server.
XQEngine - XML Query Engine: Download the XML Query engine used in the tutorial.

Discuss

Participate in the discussion forum.
Stuck on an XQuery problem? Just want to know what's going on in the XQuery world? Stop on by at the XPath and XQuery forum and drop us a line.

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