Hello ConTeXist.
Petr Olsak (maintainer of Czech/Slovak support for TeX) helped me with
simple typing of sign charts. He made a PlainTeX macro who is working
too in ConTeXt (see
http://tex.stackexchange.com/questions/230273/typing-of-math-sign-charts).
Petr Olsak (not ConTeXt even LaTeX user) was modified PlainTeX macro to
work in ConTeXt and asked the question:
"Does anybody know why ConTeXt sets catcode of & to 12? This means that
it is incompatible with plain TeX".
May I therefore ask , what is the reason that has character & catcode
other than in Knuth PlainTeX?
There are catcodes of other characters incompatible?
Thanx Jaroslav Hajtmar
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