Yes... The only problem is that it would be hard (or impossible) to write aschema for this.
Ummm... why?
IE what if I said that the content type was text/xml and text/html??? That might confuse a lot of applications.
It would? Wouldn't that just mean it was XHTML? -- [ "Aaron Swartz" ; <mailto:me@aaronsw.com> ; <http://www.aaronsw.com/> ]