Top level cond: @cond true | is true | is false @

@@cond_test bool :
  Using cond in klammer: @cond *bool* | is true | is false @
@@

@cond_test true @

@@frac a | b : *a*/*b* @@

A fraction: @frac 2 | 3 @

@@cond_klammer_test bool :
@cond *bool*  | @frac 1 | 2 @ | @frac 2 | 1 @ @
@@

# @cond_klammer_test true @