As has been repeatedly discussed, a key tenet of the MIME
definition of "charset" is that
"No further parameters need to be parsed to get the
complete identity of the character set."
I was going to ask this list (next Monday, so the question
wouldn't get lost over the weekend) for some more explanation of
this rule.
From 822ext-minutes-91nov.txt:
(d) Character set issues
The Working Group specified the definition of a character set
for the purposes of quad-x to be a unique mapping of a byte
stream to glyphs, a mapping which does not require external
profiling information.
My reason for asking, of course, is that a strict reading of this
rule would seem to prevent utilizing the new language tag to
disambiguate unified Han characters.
The above definition states that "charset", not other header fields,
should contain enough profiling information to disambiguate unified
Han characters.
Masataka Ohta