Peter Constable asked
> On page 50 of U3, last paragraph, I read the following:
> "Some specific nonspacing marks override the default
> stacking behaviour by being positioned side-by-side rather
> than stacking or by ligaturing with an adjacent nonspacing
> How do I tell which this applies to?
Sometimes the Unicode script description mentions it, other
times knowledge of the writing system is needed.
Greek and Hebrew immediately spring to mind.
> If, suppose, there were some writing system in which
> diacricits like acute and circumflex (say) occured, but the
> could co-occur over the same base character and in that
> situation were expected to be positioned side-by-side, what
> would it take to handle that?
Vietnamese uses the Latin script but doesn't behave as normal.
See for example U+1EA7. Language tagging might be the best
way around the problem. (Special forms of the accent seem to
be frowned upon - see the deprecated U+0341.)
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