12.0.5 `print_open_math_tfb_form'
---------------------------------

print_open_math_tfb_form(S)
     :  It transforms S to a tfb format of OpenMath XML.

   Description:

      It is experimental. You need to load taka_print_tfb.rr  to call
     it.


   Example:
      print_open_math_tfb_form(quote(f(x,1/(y+1))+2));

