In <200204251938(_dot_)g3PJc6e10910(_at_)astro(_dot_)cs(_dot_)utk(_dot_)edu>
Keith Moore <moore(_at_)cs(_dot_)utk(_dot_)edu> writes:
If case-folding is done before encoding as in nameprep, then the comparison
will succeed. If the case-folding is not done, then the comparison will
fail unless the two local-parts being compared are spelled with the same
casing - essentially forcing case-insensitivity.
Case-folding is easily done in ASCII, and even in ISO-8859-1, but there is
no way a mailer can do case folding in some strange part of Unicode that
it has never heard of (or which had not even been defined at the time that
mailer was compiled).
We had this problem with newsgroup-names in Usefor, and the best we could
do was to say that they MUST be in lower-case (to be enforced by hierarchy
administrators who issue newgroup messages). Anyone who types a name with
an upper -case letter MIGHT be lucky and have it arrive in the correct
newsgroup, but more likely it would result in posting to s non-existent
group.
BTW, how does NAMEPREP cope with this problem? Looks like another draft I
need to look at :-( .
--
Charles H. Lindsey ---------At Home, doing my own thing------------------------
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