There are in fact about 70 combinations of marks that may be needed for
polytonic Greek that are not precomposed in Unicode. This includes the
upsilon + smooth breathing already mentioned, epsilon and omicron with
circumflex (and with breathings) used in epigraphy, as well as all the
doubtful vowels with macron plus accents/breathings. The latter are
used in grammars and reference books that want to show quantity (not
normally printed in standard editions of literary texts).
If I were to make a complete OT Greek font, with all the above as well
as the combinations already in Unicode, which would provide better
performance: substitutions or positioning via OT features?
> However, I agree that in the case of polytonic Greek,
> given the relatively small number of unencoded glyphs that would be
> required, it makes more sense to use ligature substitutions.
> John Hudson
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