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David,
Its an interesting point that you make. Mime types are just hints made
available in a specific recipient processing context. It is not just
the sender that selects them, but they are implicitly configured with
identifiable combinations of sender and receiver in mind. Your point
about an xhtml+xlink+svg+mathml document then is answered by "what is
intelligible to the recipient?".
Greg
David Carlisle wrote:
>>Thus, the official
>>MIME type assignment to XML data is:
>>
>>
>
>
>
>> application/xml
>>
>>
>
>This is only the case (possibly the minority of cases) where there isn't
>a more specific mime type (either registered or in use in the wild)
>
>so XHTML documents are XML but may be
> text/html (grr:-) or application/xhtml+xml
>
>XSLT documents are XML but may be
> text/xsl (never registered) or application/xsl+xml
>
>SVG documents are XML but may be image/svg+xml
>
>etc...
>
>In some cases you may be able to tell (or guess) from the media type
>name that the document is XML, for example if it follows the ...+xml
>convention of RFC 3023, but in general the only way to know if a
>document format identified by a media type is XML or not is to look up
>the media type registration and read the text.
>
>Basically Media types were not designed for XML and are a pretty bad
>fit. If you lable everything as application/xml then they lose their
>original purpose of being able to trigger an appropriate program
>to handle the data, you typically do not want to send SVG and ChemML to
>the same viewing application. Conversely if you lable each vocabulary
>with a different mime type, there has never really been a good answer to
>give to the question of what mime type you give to a
>xhtml+xlink+svg+mathml document.
>
>
>David
>
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