From: Mark Davis (firstname.lastname@example.org)
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
> 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.
The general category is Space_Separator, *not* a format character.
Now wording there could definitely be clearer, but the operant phrase
> ...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
► “Eppur si muove” ◄
----- Original Message -----
From: "Peter Kirk" <email@example.com>
To: "Mark Davis" <firstname.lastname@example.org>
Cc: "Unicode List" <email@example.com>
Sent: Tuesday, August 05, 2003 14:50
Subject: Re: Display of Isolated Nonspacing Marks (was Re: Questions
> On 05/08/2003 14:40, Mark Davis wrote:
> >Where did you get the notion that space is not a base character?
> >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
> >a combining mark in isolation you use a space (or NBSP).
> >► “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
> > 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
> > 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
> > format character. >>
> > Accordingly, by definition, spaces are not base characters.
> Peter Kirk
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