Re: Display of Isolated Nonspacing Marks (was Re: Questions on ZWNBS...)

From: Peter Kirk (
Date: Tue Aug 05 2003 - 17:50:09 EDT

  • Next message: Mark Davis: "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).
    >► “Eppur si muove” ◄
    I got this from the Unicode Standard 4.0, as quoted by Jim Allan:

    > In 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
    > << _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

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