Beta [RFE]: the validator should take into account Mime-type discrepancies

Hello,

The current Beta validator doesn't signal as fault a mime-type
discrepancy such as the one for http://www.w3.org/TR/xhtml11/. Namely,
http://www.w3.org/TR/xhtml11/ is served as text/html while it's using
XHTML 1.1 which is not compatible with text/html, but the validator
doesn't complain at all:
http://validator.w3.org:8001/check?uri=http%3A%2F%2Fwww.w3.org%2FTR%2Fxhtml11%2F

I think a warning or better an error would be in order. I'm not sure if
that something that could be added in this cycle of development, but
that would be neat.

Dom
-- 
Dominique Hazaël-Massieux - http://www.w3.org/People/Dom/
W3C/INRIA
mailto:dom@w3.org