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Conditional block. Its arguments are evaluated (see section EXPR - Evaluate and emit an Expression) and
if the result is non-zero or a string with one or more bytes,
then the condition is true and the text from that point
until a matched ELIF, ELSE or ENDIF is emitted.
ELIF introduces a conditional alternative if the IF
clause evaluated FALSE and ELSE introduces an unconditional
alternative.
[+IF <full-expression> +] emit things that are for the true condition[+ ELIF <full-expression-2> +] emit things that are true maybe[+ ELSE "This may be a comment" +] emit this if all but else fails[+ ENDIF "This may *also* be a comment" +]
<full-expression> may be any expression described in the
EXPR expression function, including the use of apply-codes
and value-names. If the expression yields an empty string, it
is interpreted as false.
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