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

From: Ted Hopp (
Date: Tue Aug 05 2003 - 18:53:20 EDT

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    On Tuesday, August 05, 2003 5:40 PM, 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.

    Well, I think Jim Allan pointed to the source of this notion in his email of
    a few hours ago.

    1) From the UCD:

    2) From Unicode 3, Section 4.5, third paragraph (in its entirety):
    "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 General Category assigns only a single value to each

    I believe that reasonable people might reasonably conclude from factoids 1
    and 2 that SPACE is indeed a format character.

    Reasonable, but evidently wrong. Explanation, please?


    Ted Hopp, Ph.D.
    ZigZag, Inc.

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