[whatwg] several messages about XML syntax and HTML5

[Martin Atkins]

Elliotte Harold wrote:
> 
> What you keep missing is, it's not just about browsers. Not all clients 
> are classic web browsers. The same documents are sent to many different 
> kinds of clients that do many different things. I need to pass 
> well-formed XML to my non-browser tools, and readable HTML to classic 
> browsers.
> 
> That means I have to send text/html to browsers (because that's the only 
> thing they understand) and let my clients ignore that hint.
> 

Isn't this what the "Accept:" header is for?