Definition of Values of Property Vertical_Orientation

[Asmus Freytag]

The updated draft will become public with the release of Unicode 15.0.0 
in a few short days. For release mgmt reasons, "proposed.hmtl" is no 
longer being updated. There will be a rather extensive text describing 
possible migration issues on the main page for Version 15.

VO is not affected this release, the best suggestion we have on the 
table is to add a DerivedVO file and have that one be like all the other 
DerivedXXX files that have added the multiple @missing lines.

That would sidestep any issues for parsers written for the original VO 
file, and incidentally treat it on the same footing as EAW and LB.

That would seem to take care of it for this round. Thanks for raising 
the issue.

A./

On 8/25/2022 1:04 AM, Richard Wordingham via Unicode wrote:
> On Wed, 24 Aug 2022 09:53:39 -0700
> Asmus Freytag via Unicode<unicode at corp.unicode.org>  wrote:
>
>> On 8/23/2022 6:36 PM, Richard Wordingham via Unicode wrote:
>>> Remember that the current draft of UAX #44 for Unicode 15.0 says
>>> that comment lines should not be parsed.  The need to parse
>>> ostensible comment lines needs to be publicised.
>> This is no longer the case.
>>
>> The draft has been updated to clearly point to the @missing
>> conventions. (Thanks to the participants in this discussion for
>> identifying the oversight).
>>
>> The @missing conventions as such are not new, the only thing that is
>> being changed, as result of a very deliberate UTC decision is to make
>> the @missing convention correctly cover the few properties with
>> complex defaults.
> Not yet in the outside world.
> https://www.unicode.org/reports/tr44/proposed.html  is Draft 8, dated 4
> August 2022.
>
> And clear authority to parse and interpret will be new once it is given.
>
> Richard.

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