From: Peter Constable <>
Date: Sun, 21 Aug 2011 19:50:19 +0000

From: [] 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.

Received on Sun Aug 21 2011 - 14:54:01 CDT

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