W3C Ubiquitous Web Domain

Extensible Markup Language (XML) Activity Proposal

Executive Summary

W3C, as the home of XML, carries responsibility for the core family of XML specifications. XML is enormously successful as a markup language for documents and data, and is becoming assumed to be part of systems and products. It is used in a wide variety of domains: text, graphic, protocol, voice, music, math, programming, user interface, and many more. You will find XML technologies today in automobiles, aircraft, mobile 'phones, televisions and video recorders, cameras, printers, portable media players, photocopiers, and in many more places, hidden under the surface. With XML, W3C has provided the world's leading infrastructure for information.

Although ongoing discussions about an XML 2.0 come and go, the primary message W3C hears from its members is that they value stability. As a result, no work in the area of a major new version of XML is planned at this time. As XML, XProc, XQuery and XSLT are used increasingly in servers and for large Web application back-ends, possible new work has been suggested in the areas of high-performance XML and of exploring issues surrounding large-scale XML applications.


The XML Activity will continue to work on the Extensible Markup Language and related specifications. Primary work products will be new and revised specifications and notes on relevant topics. Over the two years of this chartered period, the XML Activity will continue current work on XML itself and the closely-related specifications, as well as Efficient XML Interchange, the XML Processing Model, XML Query, XML Query Update, Full Text, XSLT (including Streaming Transformations and also JSON interchange), XML Print and layout and XML Schema. Since the last rechartering, some work was completed; the SML Working Group was closed, and the XML Processing Model (XProc) Working Group published its primary deliverable and is now mainly in maintenance mode, and considering requirements for a new version.

No major new areas of work are introduced in this proposal. The previously-disused XML Plenary Interest Group is no longer chartered. The XML Query and XSLT Working Groups have decided to rationalise their version numbers, and are therefore working on XSLT 3.0, XQuery 3.0, XPath 3.0, XQueryX 3.0 and so forth, rather than the previous confusing mix of 2.1 and 1.1 version numbers.

This Activity Proposal also splits the XSL Working Group into two separate groups, XSLT and XML Print and layout. The XSLT Working Group has for many years operated as if it were two separate groups in most respects, and this change will improve openness and accountability.

Extension of Existing Group Charters

Proposed Timeline

It is proposed that the XML Activity last through the end of January 2013. See also the summary of the XML Activity table below for details per Working Group.

Resource Statement

The resources required include:

The individual Working Group charters indicate the exact amount of Team Contact resources. Approximately 1.25 FTE of Team resources are currently allocated to this Activity, divided among two people. Of these, Michael Sperberg-McQueen is part-time, and was hired specifically for work on XML Schema; Liam Quin, the XML Activty Lead, is full-time.

Two of the Working Groups in this Activity (XProc and EXI) are expected to complete their remaining documents during this chartered period, and will then go into maintenance mode, using fewer resources.

Summary of Proposed Activity Structure

Group Chair Team Contact Charter Period
Efficient XML Interchange Working Group Michael Cokus, Takuki Kamiya Liam Quin Chartered until 30 June 2012
XML Processing Working Group Norman Walsh Liam Quin. Chartered until 31 Jan 2012
XML Coordination Group Paul Grosso Liam Quin Chartered until 31 January 2013
XML Core Working Group Paul Grosso, Norman Walsh Liam Quin. Chartered until 31 January 2013
XML Query Working Group Jim Melton Liam Quin. Chartered until 31 January 2013
XML Schema Working Group David Ezell Michael Sperberg-McQueen, Liam Quin Chartered until 30 January 2012
XSLT Working Group Sharon Adler Liam Quin Chartered until 31 January 2013
XML Print and Page Layout Working Group Liam Quin Liam Quin Chartered until 31 January 2013

Liam Quin, XML Activity Lead
$Date: 2011/03/22 14:19:59 $