[Specifications, Patent Disclosures, Discussion/Feedback, Products, Other]

XML Query

The mission of the XML Query working group is to provide flexible query facilities to extract data from real and virtual documents on the Web, therefore finally providing the needed interaction between the web world and the database world. Ultimately, collections of XML files will be accessed like databases.

Specifications

XML Query Specifications:

• XML Query Requirements, last release 16 February 2001
• NEW: XML Query Use Cases , last release 16 August 2002
• NEW: XQuery 1.0 and XPath 2.0 Data Model (replaces the former XML Query Data Model), last release 16 August 2002
• NEW: XQuery 1.0 and XPath 2.0 Formal Semantics , last release 16 August 2002
• NEW: XQuery 1.0: An XML Query Language, last release 16 August 2002
• XML Syntax for XQuery 1.0 (XQueryX), first release 7 June 2001
• NEW: XQuery 1.0 and XPath 2.0 Functions and Operators Version 1.0, last release 16 August 2002
• XPath Requirements Version 2.0, last release 14 February 2001
• NEW: XML Path Language (XPath) 2.0, last release 16 August 2002

Note that many of the powerful and structured facilities of XML Query have been recognized as so fundamental that they are going to be incorporated into the next version of XPath, namely XPath 2.0. The XML Query working group co-leads the XPath 2.0 effort, together with the XSL working group, and is co-author of the XPath 2.0 specifications.

Patent Disclosures

Discussion/Feedback:

• W3C contact: Massimo Marchiori (massimo@w3.org)
• Mailing lists:

  www-ql@w3.org (431 subscribers on April 30, 2002)

  The public mailing list on query languages, including (but not limited to) discussion on the XML-Query project. This list originated from the QL'98 w3c-ql@w3.org mailing list, and has now become a public list (see the migration announcement). Only subscribed users can post to this list. Subscription is open to everybody: to subscribe or unsubscribe just send a message to www-ql-request@w3.org with your request. The list is publicly archived at http://lists.w3.org/Archives/Public/www-ql/.

  public-qt-comments@w3.org

  This public mailing list is used to submit comments on the publications of the XML Query and XSL working groups. This is not a discussion list (use www-ql@w3.org instead), and so you can't subscribe: this list is just a way for people to provide their comments to the XML Query and XSL wg's, and for the wg's to reply. The list is publicly archived at http://lists.w3.org/Archives/Public/public-qt-comments/.

Products

[If you want to add a product, and/or add more information about one of the products listed below, or give any other suggestion, please send an email to both massimo@w3.org and pcotton@microsoft.com.]

Implementations

The following is a (non-comprehensive) list of implementations of the XML Query working drafts. The list includes publicly available partial implementations and prototype implementations of XQuery:

• W3C's Grammar Test Pages:
  • The XQuery 1.0 Grammar Test Page
  • The XPath 2.0 Grammar Test Page

• Cognetic Systems's XQuantum: http://www.cogneticsystems.com/xquery/xquery.html
• Enosys Software's XQuery Demo : http://xquerydemo.enosyssoftware.com
• eXcelon's eXtensible Information Server (XIS): http://www.xmlquickstart.com/
• Fatdog's XQEngine: http://www.fatdog.com/
• GAEL's Derby: http://www.gael.fr/derby/
• GNU's Qexo (Kawa-Query): http://www.qexo.org/
  Compiles XQuery on-the-fly to Java bytecodes. Based on and part of the Kawa framework. Open-source.
• Ipedo's XML Database v3.0: http://www.ipedo.com
• IPSI's IPSI-XQ: http://ipsi.fhg.de/oasys/projects/ipsi-xq/index_e.html
• Lucent's Galax: http://db.bell-labs.com/galax/
• Microsoft's XML Query Language Demo: http://xqueryservices.com
• Nimble Technology's Nimble Integration Suite: http://www.nimble.com/
• OpenLink Software's Virtuoso Universal Server: http://demo.openlinksw.com:8890/xqdemo
• Oracle's XML DB: http://otn.oracle.com/tech/xml/xmldb/htdocs/querying_xml
• QuiLogic's SQL/XML-IMDB: http://www.quilogic.cc/xml.htm
• Software AG's QuiP: http://www.softwareag.com/developer/downloads/default.htm
• Sourceforge's Kweelt: http://kweelt.sourceforge.net/. Open-source.
• SourceForge's XQuench: http://xquench.sourceforge.net/. Open-source.
• X-Hive's XQuery demo: http://www.x-hive.com/xquery
• XML Global's GoXML DB: http://www.xmlglobal.com/prod/xmlworkbench/

Related Products

The following is a (non-comprehensive) list of announcements of products that will include some support for XQuery:

• E-XMLMedia's XMLizer: http://www.e-xmlmedia.com/prod/xmlizer.htm
• XQRL: http://www.xqrl.com/

Other Pointers

• Process XML using XML Query, tutorial, 2002.
• What is Xquery?, introductory article, 2002.
• Presentation on XPath and XQuery held at the 11^th International World Wide Web Conference (WWW2002), Hawaii, May, 2002.
• What's new in XPath 2.0, introductory article, March, 2002.
• Presentation on XML-Query held at the 20^th Unicode Conference, Washington, January, 2002.
• Presentation on XML-Query held at the 10^th International World Wide Web Conference (WWW10), Hong Kong, May, 2001.
• Presentation on XML-Query held at the 9^th International World Wide Web Conference (WWW9), Amsterdam, May 19, 2000.
• The Query Languages'98 (QL'98) workshop, with its unique collection of contributed works.
• The XML Activity Statement also explains the W3C's work on query languages.
• The XML-Query Working Group page (W3C members ony)

Massimo Marchiori, W3C Contact for XML Query
First created April 2000.
Current: $Revision: 1.125 $ $Date: 2002/09/24 17:47:43 $

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