# Modularization of XHTML™ 2.0

## W3C Editor's Draft 23 January 2009

This version:
  http://www.w3.org/MarkUp/2009/ED-xhtml-modularization2-20090123
Latest public version:
  http://www.w3.org/TR/xhtml-modularization2
Previous Recommendation:
  http://www.w3.org/TR/2008/REC-xhtml-modularization-20081008
Editors:
  Mark Birbeck, x-port.net
  Markus Gylling, DAISY Consortium
  Shane McCarron, Applied Testing and Technology
  Steven Pemberton, CWI (XHTML 2 Working Group Co-Chair)

This document is also available in these non-normative formats: Single XHTML file, PostScript version, PDF version, ZIP archive, and Gzip'd TAR archive.

Copyright © 2001-2009 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C liability, trademark and document use rules apply.

## Abstract

This Working Draft specifies an abstract modularization of XHTML and an implementation of the abstraction using XML Document Type Definitions (DTDs), XML Schema, and RelaxNG. This modularization provides a means for subsetting and extending XHTML, a feature needed to permit the definition of custom markup languages that are targeted at specific classes of devices or specific types of documents.

## Status of This Document

This section describes the status of this document at the time of its publication. Other documents may supersede this document. The latest status of this document series is maintained at the W3C.

This document is the development version of a very early form and is riddled with errors. It should in no way be considered stable, and should not be referenced for any purposes whatsoever.

This document has been produced by the W3C XHTML 2 Working Group as part of the HTML Activity. The goals of the XHTML 2 Working Group are discussed in the XHTML 2 Working Group charter.

This document was produced by a group operating under the 5 February 2004 W3C Patent Policy. W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy.

Please report errors in this specification to www-html-editor@w3.org (archive). It is inappropriate to send discussion email to this address. Public discussion may take place on www-html@w3.org (archive).

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