Why doesn't Ideographic (ID) in UAX#14 have half-width katakana?

Koji Ishii kojiishi at gmail.com
Thu Aug 20 01:18:06 CDT 2015

Right, this should be applied to only where currently AL.

The basic idea is that, full width is a concept to use a character in an
"imported" manner and thus different characteristics are applied, while
half width is a concept of saving screen real estate and/or for legacy
cultural usages so the characteristics should be the same as its full width
counterpart, except the width.

Roozbeh, thank you for the date, I'll work by then.


On Thu, Aug 20, 2015 at 1:45 AM, Ken Whistler <kenwhistler at att.net> wrote:

> I don't think that is the issue. U+FF9E/F are already lb=NS, which prevents
> line breaks before. The issue is instead loosening up the lb class for
> the halfwidth katakana syllables (from lb=AL to lb=ID), so that they *can*
> break the way the regular katakana syllables do.
> --Ken
> On 8/19/2015 9:21 AM, fantasai wrote:
>> On 05/04/2015 02:19 PM, Peter Edberg wrote:
>>> I have been checking with various groups at Apple. The consensus here is
>>> that we would like to see the linebreak value for
>>> halfwidth katakana changed to ID.
>> Do we want all halfwidth kana changed to ID, or should there
>> be some exception for the voicing marks (U+FF9E, U+FF9F) to
>> forbid breaks before?
>> ~fantasai
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