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Re: [css-text] I18N-ISSUE-308: Definition of 'grapheme cluster'

From: fantasai <fantasai.lists@inkedblade.net>
Date: Sat, 10 May 2014 11:21:28 -0700
Message-ID: <536E6E28.4090206@inkedblade.net>
To: www-style@w3.org
On 04/20/2014 10:55 PM, James Clark wrote:
>
> I believe this wording came about because of an issue I raised for Thai.  See
>
> http://lists.w3.org/Archives/Public/www-style/2013Sep/0542.html
> http://lists.w3.org/Archives/Public/www-style/2013Sep/0632.html
>
> Fundamentally, the issue is that for Thai (and almost certainly Lao)
> there are two distinct concepts which do not always coincide (though
> they often do):
>
> a) positions between *characters* that are possible caret positions
>
> b) positions between *glyphs* where it is typographically conventional
>   to insert letter-spacing
>
> The Unicode grapheme cluster concept is closest to (a).
>
> (a) is a good starting point for (b), but in my view it is rather
> confusing to treat (b) as a 'tailoring' of (a): they are different
> concepts operating in different realms (characters vs glyphs).

Yes, I think we probably need to introduce two different terms here.
Both would be tailorings of UAX29's grapheme clusters, though, because
that's what we have to work with...

~fantasai
Received on Saturday, 10 May 2014 18:21:55 UTC

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