Unifying E_Modifier and Extend in UAX 29 (i.e. the necessity of GB10)

[Manish Goregaokar via Unicode]

> Note: we are already planning to get rid of the GAZ/EBG distinction (
http://www.unicode.org/reports/tr29/tr29-32.html#GB10) in any event.


This is great! I hadn't noticed this when I last saw that draft (I was
focusing on the Virama stuff). Good to know!


> Instead, we'd add one line to
*Extend <http://www.unicode.org/reports/tr29/tr29-32.html#Extend>:*

Yeah, this is essentially what I was hoping we could do.

Is there any way to formally propose this? Or is bringing it up here good
enough?

Thanks,

-Manish

On Mon, Jan 1, 2018 at 9:17 PM, Mark Davis ☕️ via Unicode <
unicode at unicode.org> wrote:

> This is an interesting suggestion, Manish.
>
> <non-emoji-base, skin tone modifier> is a degenerate case, so if we
> following your suggestion we also could drop E_Base and E_Modifier, and
> rule GB10.
>
> Instead, we'd add one line to *Extend
> <http://www.unicode.org/reports/tr29/tr29-32.html#Extend>:*
>
> OLD
> Grapheme_Extend = Yes
> *and not* GCB = Virama
>
> NEW
> Grapheme_Extend = Yes, or
> Emoji characters listed as Emoji_Modifier=Yes in emoji-data.txt. See [
> UTS51 <http://www.unicode.org/reports/tr41/tr41-21.html#UTS51>].
> *and not* GCB = Virama
>
> Note: we are already planning to get rid of the GAZ/EBG distinction (
> http://www.unicode.org/reports/tr29/tr29-32.html#GB10) in any event.
>
> Mark
>
> On Mon, Jan 1, 2018 at 3:52 PM, Richard Wordingham via Unicode <
> unicode at unicode.org> wrote:
>
>> On Mon, 1 Jan 2018 13:24:29 +0530
>> Manish Goregaokar via Unicode <unicode at unicode.org> wrote:
>>
>> > <random non-emoji, skin tone modifier> sounds very much like a
>> > degenerate case to me.
>>
>> Generally yes, but I'm not sure that they'd be inappropriate for
>> Egyptian hieroglyphs showing human beings.  The choice of determinative
>> can convey unpronounceable semantic information, though I'm not sure
>> that that can be as sensitive as skin colour.  However, in such a case
>> it would also be appropriate to give a skin tone modifier the property
>> Extend.
>>
>> Richard.
>>
>
>
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