"LS" == Laurent Siebenmann writes:

 LS> I believe "cyrapos" is a better designation than "textapos". The
 LS> latter would suggest diacritic status.

is the apos character (letter modifier) used in other (non-cyrillic)
languages? i think that yes, since it is defined in non-cyrillic
unicode area. then, the name `cyrapos' is limiting.

 LS> Why not \apostrophe or \apos ??  The reason lies in the
 LS> convention that every cyrillic letter should in the TeX world
 LS> have a name beginning with \cyr or \CYR.

and if the letter is not a cyrillic-only, bug of wider usage, it
should probably be named without a `cyr' prefix.

 LS> Of course there are still nagging questions. Should there exist
 LS> both \CYRAPOS and \cyrapos as letter status suggests.  There is
 LS> no obstacle to this since one can "equate" them at the glyph
 LS> level. And unequate them if and when some typographer decides to
 LS> make a geometric distinction no matter how slight.

well, since there is no upper/lowercase variant defined for apos, we
should define only one such character. there already exists an example
of such character: \CYRpalochka, which is invariant to upper/lowercase
conversions.

Best,
v.