> Seeing strange errors pop up when using the YUI with documents served under
application/xhtml+xml, I realize that YUI doesn't support this even though this
is the standard way to serve XHTML documents...
I think you're confused. No versions of IE (even IE7) support this, for
example.
http://www.w3.org/People/mimasa/test/xhtml/media-types/results
-- Charles