Zero-Width Joiner U+200D

Andrew West andrewcwest at gmail.com
Tue Feb 21 06:34:20 CST 2023


On Tue, 21 Feb 2023 at 11:52, Jukka K. Korpela via Unicode
<unicode at corp.unicode.org> wrote:
>
>  Asmus Freytag via Unicode (unicode at corp.unicode.org) wrote:
>
>> Clearly one of the design features was to also support "didactic" formatting, that is, bracketing a character with joiners or non-joiners to be able to show positional forms in isolation.
>
>
> If that was, and is, the intent, then the standard apparently should be amended, adding such descriptions. At present, the description only deals with the effect of ZWJ when it appears between two graphic characters, and it is difficult to avoid the impression that in other contexts it should be ignored. In any case, there is no requirement or recommendation or even suggestion about its effect when used at the start of a string or at the end of a string.

The use of ZWJ to show positional forms in isolation is explicitly
discussed in the Unicode Standard for Mongolian
(https://www.unicode.org/versions/Unicode15.0.0/ch13.pdf#G27803 p.
559) and Phags-pa
(https://www.unicode.org/versions/Unicode15.0.0/ch14.pdf#G40430 pp.
604-605).

Andrew



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