Constantine Stathopoulos asked why "oxia" and its combinations
are coded distinctly from "tonos" and its combinations in
Unicode.
The basic answer is that the Greek National Body (ELOT)
insisted on the inclusion of a separate, complete encoding
of polytonic Greek and monotonic Greek in 10646. The polytonic
set at U+1FF0 and following was included in Unicode as part of
the merger with 10646 many years ago.
There is also a reasonable distinction to be made between oxia
and tonos, in any case, since the oxia is generally rendered
as an acute accent in polytonic Greek, whereas the tonos accent
is generally rendered with a vertical line above in monotonic
Greek. Implementations which make use of combining marks will
generally distinguish these two, even if they are grammatically
connected.
--Ken
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