[Ltru] Re: Case-insensitive rules (Was: I-D ACTION:draft-ietf-ltru-4646bis-01.txt)

[Stephane Bortzmeyer <bortzmeyer at nic.fr>]

On Wed, Dec 13, 2006 at 05:56:41AM -0800,
 Doug Ewell <dewell at adelphia.net> wrote 
 a message of 27 lines which said:

> At some point during the development of 4646, somebody argued that
> both cases needed to be specified.

He was clearly wrong. (But I sympathetize, I made the same mistake at
the beginning.)

> Can you find an RFC that states unequivocally that ABNF strings are 
> case-insensitive?  

Besides the good reference given by John Cowan, I would like to add
that RFC which do want case-sensitivity have to use numeric
values. See for instance how RFC 4627 describes the string "false"
(lowercase only):

        false = %x66.61.6c.73.65   ; false

I may add that every ABNF implementation I know of treats strings in a
case-insensitive way (as required by the RFC).

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