Re: Emacs 23 character code space

[Eli Zaretskii <eliz@gnu.org>]

> From: Kenichi Handa <handa@m17n.org>
> CC: emacs-devel@gnu.org
> Date: Fri, 07 Nov 2008 16:21:00 +0900
> 
> > This fragment from etc/NEWS:
> >     The character code space is now 0x0..0x3FFFFF with no gap.
> >     Characters of code 0x0..0x10FFFF are Unicode characters of the same code points.
> >     Characters of code 0x3FFF80..0x3FFFFF are raw 8-bit bytes.
> 
> > seems to contradict itself: it says there's ``no gap'', but the codes
> > between 0x110000 and 0x3FFF7F do constitute a gap, don't they?
> 
> Any code between 0x110000 and 0x3FFF7F are valid as
> character.  Some of them correspond to a certain character
> set, some are not.  For the latter, only utf-emacs can
> encode, and they can't be displayed with any font.  But
> still they are valid as characters.  For instance, you can
> set any syntax/category/char-code-property to them.

Thanks.  But I'm still a bit in the dark, as for how to describe this
correctly and concisely.  Do we actually use the range of codes
between 0x110000 and 0x3FFF7F?  If so, for what characters?  If we do
not use them now, are there some plans for using them in the future?