From: Asmus Freytag (asmusf@ix.netcom.com)
Date: Fri Nov 30 2007 - 19:17:29 CST
On 11/30/2007 4:33 PM, Michael Everson wrote:
> At 16:15 -0800 2007-11-30, Peter Constable wrote:
>> > From: Michael Everson [mailto:everson@evertype.com]
>>
>>> Modern Vai always uses spaces between words. As in the Bible I have
>>> here. Manuscript Vai is less scrupulous about this, but the Right
>>> Thing To Do is treat the syllables like Cherokee syllables... that
>>> is, like Latin letters.
>>
>> OK; that's helpful.
>
> I'm glad.
>
>> > >L2/05-159R has a section on line breaking that indicates that line
>>> >breaks are not permitted before SYLLABLE LENGTHENER or before NG.
>>> >Looking at the beta UCD files, though, it appears that NG (A60B) has
>>> >the same line breaking property as regular syllables (AL); it's not
>>> >clear to me if that's intended or not.
>>>
>>> That is Ken's bailiwick I guess.
>>
>> Well, I think Ken is dependent, like me, on the script experts out
>> there spec'ing the desired behaviour.
>
> OK, I suck at properties, so use small words and ask me again.
> "Intended"? Line breaks should not be permitted before SYLLABLE
> LENGTHENER or NG. So... the properites shouldn't allow breaking before
> them.
If something extends a word that itself consists of characters with type
AL, then making the extender also AL has the effect of keeping the word
together.
AL is a good default for anything that's not punctuation and that's to
be kept with words.
Special properties are needed usually only if something can occur
separated from a word (e.g. following a close paren, for example, or
inside a number) and/or where it doesn't follow a 'word' made of AL, but
things like ID (ideograph) that themselves don't bind together.
So, any marks that occur _only_ as part of words can be AL.
>
>> > >The LENGTHENER (A60C) has linebreak = EX, as does FULL STOP (A60E);
>>> >this strongly blocks break before. COMMA (060D) and QUESTION MARK
>>> >(A60F) have linebreak = BA, which less-strongly blocks break before.
>>> >(EX allows preceding break only after hard line break or ZWSP; BA
>>> >also allows a preceding break after spaces (SP) or FFFC).
>>>
>>> I can't say I know how to evaluate this.
>>
>> Consider this an invitation for any of the people that were involved
>> in the Vai proposal or with any with a connection to the primary user
>> community, to review the Unicode 5.1 beta UCD files and provide
>> feedback as needed.
>
> I'm afraid you're stuck with me. Ask questions I can answer, and I
> will answer them as best I can.
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