[XeTeX] Case changing for Greek

[Apostolos Syropoulos]

>> A possible refinement is that a lone sigma, neither preceded nor
>> followed by another letter, should probably be lowercased as σ rather
>> than ς.
>
> One that needs input from a Greek speaker!
> 

That is correct Jonathan. In fact the general rule is that a σ at the end of
a word becomes always a ς. The only exception is when the final vowel is
cut due to a grammatical phenomenon that occurs is the following:

 σώσ' τα (save them)

A.S.

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Apostolos Syropoulos
Xanthi, Greece