From: Clive D. W. Feather (clive@on-the-train.demon.co.uk)
Date: Tue Jul 03 2001 - 17:49:56 CDT
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In message <ylae2mocr0.fsf@windlord.stanford.edu>, Russ Allbery
<rra@stanford.edu> writes
>> Whereas it is _much_ harder to forbid a usage later
>> on when maybe people have been actually using it for real.
>
>Normally, I'd agree, but this case is special because it involves
>canonicalization processes and a shared resource that has to be findable
>by anyone interested in the topic. If we ban anything not in NFKC,
>we're giving an implementation permission to canonicalize to NFKC.
You make a strong point, and one that's made me reconsider the issue yet
again.
Can I propose a compromise, which might also address other issues ?
* All names must be invariant in NFKC.
* We put in a NOTE that there is insufficient experience in this area,
and implementers should be aware that a future version of this
document might change it to NFC.
* We allow agents to normalize names to NFC.
* We *forbid* injection, serving, and relay agents to apply any other
change to names.
* We say that posting agents SHOULD NOT (or Ought Not) apply any other
change to names.
* We add "uses compatibility characters" to the list of things that
could be warned against but should be disableable if necessary.
This effectively puts us in an intermediate position: no compatibility
characters allowed, but implementers strongly warned not to assume that
as an eternal truth.
Can both Russ and Charles, in particular, live with that ?
- --
Clive D.W. Feather | Internet Expert | Work: <clive@demon.net>
Tel: +44 20 8371 1138 | Demon Internet | Home: <clive@davros.org>
Fax: +44 20 8371 1037 | Thus plc | Web: <http://www.davros.org>
Written on my laptop; please observe the Reply-To address
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