From: [email protected] [mailto:[email protected]] On Behalf Of Philippe Verdy

>> In the OpenType specification....

> In addition, this specification highly depends on two things:
> - the layout engine fully knows the properties of all characters in 
> order to implement BiDi reordering as well as BiDi mirroring

Not true: mirroring depends on the resolved directionality, not the Unicode 
character properties.


> - the layout engine fully knows the necessary mappings for the OMPL
> table (this assumes that it always implements the latest version of the UCD)

No. The OMPL is fixed at TUS 5.1.




Peter



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