>  PT> The problem is, that there are no accented cyrillic vocals in
>  PT> unicode except for i and e with grave. Perhaps I don't need to
>  PT> mention, that accented vocals are urgently needed for homonymes and
>  PT> in textbooks.  So, I think, accented vocals should finally go into
>  PT> unicode. But I was told, that unicode doesn't provide slots for
>  PT> letters anymore, which can be made by the combination of other
>  PT> letters.
>
> I see that this question was already discussed on the Unicode mailing
> list: there is a thread "Cyrillic - accented/acuted vowels" on
>
> http://unicode.org/mail-arch/unicode-ml/y2005-m05/thread.html#2

I asked the same thing on the list again and it seems that there is no
way getting cyrillic accented vowels (CAV) into unicode.

http://unicode.org/mail-arch/unicode-ml/y2011-m05/0036.html

So forget the ... unicode. Let's go back to LaTeX. How to make CAV
available? I guess, 3 steps are needed:

1. create LICR representation (\cyraacute, \cyragreve, etc.)

2. create new T2 encodings

3. modify the hyphenation patterns, so accented vowels behave like the
unaccented.

The first question then is, which vowels can be accented. As far as I
know, ё in russian doesn't need to be accented, because it always gets
the stress. Right? Or how about ў in belorussian?

best regards