Re: accepted accents

    for example  @v{o} doesn't seems to exist in any language.

That one seems to be Unicode character U+01D2 (latin small letter o with
caron).  With a comment saying "Pinyin third tone", for what it's worth.

However, even if a given combination wasn't in Unicode or in any
existing language (such as @ringaccent{o}, as far as I can tell), I
still don't think we should necessarily disallow it.  Who knows what
authors might want to use for whatever nefarious purposes of their own?
And it seems an impossible maintenance problem anyway.

The examples in texinfo.txi are visual, not meaningful.  I figured it
would be simplest to use the same character to display all the accents,
for the sake of comparison.
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