>From time to time over the past several years I have served web pages as XHTML 
>1.0 with content (MIME) type text/html to IE Browsers and with content (MIME) 
>type application/xhtml+xml to Browsers that recognize that content type -- via 
>Content Negotiation. 

My current Home Page -- http://jp29.org/ -- is served in this manner. I compose 
the great majority of my pages using HTML 4.01 Markup (a few using ISO-HTML) 
and they are naturally served as text/html.

I actually started using Content Negotiation for XHTML documents as an 
experiment to see how the concept worked in practice.

I currently also employ Content Negotiation for my XHTML+RDFa test page -- 
http://jp29.org/rdfaprimerx.php -- there is no "Appendix C" provision (ala 
XHTML 1.0) for XHTML+RDFa -- if such documents are served as text/html the W3C 
Validator adds the following generic note to the successful validation report 
(quote):

"Warning Conflict between Mime Type and Document Type

The document is being served with the text/html Mime Type which is not a 
registered media type for the XHTML + RDFa Document Type. The recommended media 
type for this document is: application/xhtml+xml" . The W3C is currently 
serving some of their XHTML+RDFa documents as Content-Type text/html.

James

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