Definition of Values of Property Vertical_Orientation

Asmus Freytag asmusf at ix.netcom.com
Wed Aug 24 11:53:39 CDT 2022


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.

VO, as noted, is being delayed by one version due to resource constraints.

Parsers that rely on property values being listed explicitly for 
unassigned code points will not benefit from the change. Parsers that 
interpret @missing lines today, but can't handle multiple @missing lines 
for the same property will break visibly, and should have done so for 
the beta, or if limited to the VO file, will break visibly during the 
next beta.

Properties for assigned code points are unaffected.

A./

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