From: Mark Davis (mark.davis@jtcsv.com)
Date: Tue Aug 05 2003 - 18:09:36 EDT
> << Zs, Zl, and Zp are considered format characters, but their
> membership in the Z (separator) class takes precedence over their
> membership in the Cf class, because the General Category assigns
only
> a single value to each character. >>
Whenever you have a question about the status of a character, you need
to look it up in the UCD. You can either do that by going through the
unicode website, or if you want a more readable interface, use the ICU
character browser, which formats that data.
Look at space, U+0020.
http://oss.software.ibm.com/cgi-bin/icu/ub/utf-8/?go=0020&ch.x=4&ch.y=7
The general category is Space_Separator, *not* a format character.
Now wording there could definitely be clearer, but the operant phrase
is:
> ...but their
> membership in the Z (separator) class *takes precedence* over their
> membership in the Cf class...
So it would be cleared to say something like:
In many ways the characters, Zs, Zl, and Zp, are similar to format
characters, but because their general usage is significantly different
they are broken out into a separate General Category, as Separator
characters.
Mark
__________________________________
http://www.macchiato.com
► “Eppur si muove” ◄
----- Original Message -----
From: "Peter Kirk" <peter.r.kirk@ntlworld.com>
To: "Mark Davis" <mark.davis@jtcsv.com>
Cc: "Unicode List" <unicode@unicode.org>
Sent: Tuesday, August 05, 2003 14:50
Subject: Re: Display of Isolated Nonspacing Marks (was Re: Questions
on ZWNBS...)
> On 05/08/2003 14:40, Mark Davis wrote:
>
> >Where did you get the notion that space is not a base character?
And
> >base characters include those that are not control or format
> >characters. Space is neither one.
> >
> >The standard specifically states in a number of places that to
exhibit
> >a combining mark in isolation you use a space (or NBSP).
> >
> >Mark
> >__________________________________
> >http://www.macchiato.com
> >► “Eppur si muove” ◄
> >
> >
> >
> I got this from the Unicode Standard 4.0, as quoted by Jim Allan:
>
> > In http://www.unicode.org/book/preview/ch03.pdf the space
characters
> > in general are given class Zs:
> >
> > << Zs, Zl, and Zp are considered format characters, but their
> > membership in the Z (separator) class takes precedence over their
> > membership in the Cf class, because the General Category assigns
only
> > a single value to each character. >>
> >
> > So the various space characters (class Zs) are also classified as
> > format characters.
> >
> > From http://www.unicode.org/book/ch04.pdf:
> >
> > << _D13 Base character:_ a character that does not graphically
> > combine with preceding character, and that is neither control nor
a
> > format character. >>
> >
> > Accordingly, by definition, spaces are not base characters.
>
>
>
> --
> Peter Kirk
> peter.r.kirk@ntlworld.com
> http://web.onetel.net.uk/~peterkirk/
>
>
>
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