Any chars from UNICODE upto x10FFFF (except of xFFFE, xFFFF and the range xD800 --- xDFFF).
names must be composed of non-whitespace chars: numerals, letters, . (dot) - (comma, minus) _ (underscore) : etc., must start with a letter or _
.
-
_
:
Encoding of the UNICODE chars is not important.
