Re: [idn] rename ToUnicode?

["Mark Davis" <mark@macchiato.com>]

There is no ISO Standard for case folding; ISO 14651 is for collation.
It doesn't provide a case folding; it maps characters to weights, not
to other characters.

You are wrong about normalization. Many languages require combining
marks for correct representation, and once you have more than one
combining mark you need a mechanism for determining the ordering.

For more about collation, case mapping, and normalization, I suggest
you read:

http://www.unicode.org/reports/tr10/
http://www.unicode.org/reports/tr21/
http://www.unicode.org/reports/tr15/

Mark

(P.S. I will be unable to reply to any answer to this message, since I
will be en route to Dublin.)
__________

http://www.macchiato.com

 "Eppur si muove"
----- Original Message -----
From: "Keld Jørn Simonsen" <keld@dkuug.dk>
To: "IETF idn working group" <idn@ops.ietf.org>
Sent: Monday, May 13, 2002 04:30
Subject: Re: [idn] rename ToUnicode?


> On Mon, May 13, 2002 at 10:55:53AM +0000, Adam M. Costello wrote:
> > Dan Oscarsson <Dan.Oscarsson@trab.se> wrote:
> >
> > > IETF should refer to official standards organisations if
possible.
> >
> > Correct me if I'm wrong, but I think ISO-10646 does not define
> > normalization forms or case folding.  Therefore IDNA cannot avoid
> > referencing Unicode.  Once we reference Unicode, there's no point
in
> > referencing ISO-10646, because it doesn't contain anything of
interest
> > that isn't already in Unicode.
>
> ISO does define case folding, and ISO says that given a specific
> repertoire of 10646 for identifiers you need no normalization.
>
> > For practical reasons, isn't it preferable to reference a spec
that's
> > easily available?  The Unicode standard is on the web for anyone
to view
> > at no charge.  Is the same true of ISO-10646?
>
> the ISO 10646 case folding data is available from the web too.
> It is included in the ISO 14651 standard.
>
> Keld
>
>