Re: [idn] WG Update

["tsenglm@????.??.tw" <tsenglm@cc.ncu.edu.tw>]

----- Original Message -----
From: "David Hopwood" <david.hopwood@zetnet.co.uk>
> -----BEGIN PGP SIGNED MESSAGE-----
>
> Erin Chen wrote:
> > As in the 2. General Requirements of 2.3 Canonicalization
> >
> > [21] In order to retain backward compatibility with the current DNS,
> > the service MUST retain the case-insensitive comparison for US-ASCII
> > as specified in RFC 1035. For example, Latin capital letter A (U+0041)
> > MUST match Latin small letter a (U+0061). Unicode Technical Report #21
> > describes some of the issues with case mapping. Case-insensitivity for
> > non US-ASCII MUST be discussed in the protocol proposal.
> >
> > I recommend modify the last line "MUST be discussed" to be
> > "MUST be provided", as to be " Case-insensitivity for non US-ASCII MUST
be
> > provided in the protocol proposal"
>
> I disagree. As it happens, all of the proposals provide case-insensitivity
> for non-US-ASCII, but it is *not* a requirement. The protocol would work
> fine and would be perfectly acceptable to users without it. We should be
> clear about the difference between features that are *desirable* (in this
> case for consistency), and *required* features.
>
              I  think the requirement in case-insensitives for non-US-ASCII
should be specified in applied rang of UNICODE , that is only applied to
"Han" characters only.
> In particular, preservation of case is wholly unnecessary, IMHO.
> [21] is perfectly OK as it is (although much of the rest of the
requirements
> draft is not; I'll discuss that in another post).
>
>
> <tsenglm@csie.ncu.edu.tw> wrote:
> > The TC/SC equivalent class is always conceptually described by the
> > similar properties of  case in ASCII characters, ...
>
> No, it is not. TC/SC folding is an entirely separate issue to case
> folding. As I've pointed out before, it is counterproductive to try to
> argue by an analogy that a consensus of the WG does not accept.
>
         Right !  Describing TC/SC with the term "case folding" will
produce confusing .  TC/SC equivalence class will be translated to ACE ASCII
with CASE , so it can be caseinsensitive comparison  and  also be recoveried
to their original scripts form .  In this siyuation , it is very different
from pure-ASCII characters case folding.

L.M.Tseng