<
(output_if lisp-expression)>
<
else>
<
endif>
Depending on the result of the lisp-expression, code-on-true or
code-on-false will be produced. Again, neither <
(output_if)>
, nor
<
else>
or <
endif>
return any string value, thus producing no
output at all. Any code generated results from the application of the UNFUG
evaluator to the respective code parts.