Corrigendum #9

Asmus Freytag asmusf at
Sat May 31 11:17:45 CDT 2014

On 5/31/2014 4:09 AM, Philippe Verdy wrote:
> 2014-05-30 20:49 GMT+02:00 Asmus Freytag <asmusf at 
> <mailto:asmusf at>>:
>     This might have been possible at the time these were added, but
>     now it is probably not feasible. One of the reasons is that block
>     names are exposed (for better or for worse) as character
>     properties and as such are also exposed in regular expressions.
>     While not recommended, it would be really bad if the expression
>     with pseudo-code "IsInArabicPresentationFormB(x)" were to fail,
>     because we split the block into three (with the middle one being
>     the noncharacters).
> If you think about pseudocode testing for properties then nothing 
> forbifs the test IsInArabicPresentationFormB(x) to check two ranges 
> onstead of just one.
Besides the point.

The issue is that the result of evaluation of an expression would change 
over time.


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the Unicode mailing list