noa wrote:
The W3C validator does recognise "application/xhtml+xml". The problem might be that you're not checking for the W3C's user agent string when you decide which browsers to send which MIME type to. The string is "W3C_Validator".
Checking for user agent doesn't make sense; there are too many browsers to check for each one and I would have to know what each one does. It makes much more sense to let the UA tell you which mime types it accepts, as it is suppose to do. Therefore, by not including "application/xhtml+xml" in the header, it's saying that it doesn't recognize it.
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