Fw: Serving the Most Appropriate Content to Multiple User Agents from a Single Document Source: XHTML Media Types

I thought the web developers among us would want to see this.


James D Homme, Usability Engineering, Highmark Inc.,
james.homme@xxxxxxxxxxxx, 412-544-1810

"The difference between those who get what they wish for and those who
don't is action. Therefore, every action you take is a complete
success,regardless of the results." -- Jerrold Mundis
Highmark internal only: For usability and accessibility:
----- Forwarded by James D Homme/Contractor/Highmark on 11/05/2008 11:43 AM
             "Gregory J.                                               
             <oedipus@xxxxxxxx                                          To
             t>                        wai-xtech@xxxxxx, w3c-wai-ig@xxxxxx
             Sent by:                                                   cc
             w3c-wai-ig-reques         wai-liaison@xxxxxx              
             t@xxxxxx                                              Subject
                                       Serving the Most Appropriate    
                                       Content to Multiple User Agents 
             11/05/2008 11:02          from a Single Document Source:  
             AM                        XHTML Media Types               


as many of you are aware, XHTML™ 1.0, The Extensible HyperText Markup
Language (A Reformulation of HTML 4 in XML 1.0 - Second Edition)

   * [http://www.w3.org/TR/xhtml1]

included an informative Appendix C: "HTML Compatibility Guidelines"

   * [http://www.w3.org/TR/xhtml1/#guidelines]

now, the XHTML2 Working Group has clarified how to use XHTML 1.0 to
serve the most appropriate content to multiple user agents from a
single document source, in a new document:

"XHTML Media Types: Serving the Most Appropriate Content to Multiple
User Agents from a Single Document Source"; current drafts of XHTML
Media Types are available from

  * [http://www.w3.org/MarkUp/Drafts/Overview.html#xhtmlmime]

currently, the latest editor's draft is located at:

  * [http://www.w3.org/MarkUp/2008/ED-xhtmlmime-20081024/]

explanation: this document supersedes the informative Appendix C of
the original XHTML 1.0 Recommendation, entitled: "HTML Compatibility
Guidelines", located at:

  * [http://www.w3.org/TR/xhtml1/#guidelines]

as a normative document.

Abstract of XHTML Media Types: Many people want to use XHTML to author
their web pages, but are confused about the best ways to deliver those
pages in such a way that they will be processed correctly by various
user agents. This Note contains suggestions about how to format XHTML
to ensure it is maximally portable, and how to deliver XHTML to various
user agents - even those that do not yet support XHTML natively. This
document is intended to be used by document authors who want to use
XHTML today, but want to be confident that their XHTML content is going
to work in the greatest number of environments.

XHTML Media Types has ramifications for (at least) the AU WG, the GL WG,
the PF WG and the UA WG and it is strongly encouraged that those
concerned about serving the most appropriate content and how to achieve
such content, review the latest editor's draft at:


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