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<H1>6.4. Conditional Text</H1>
<P>Blocks of text can be conditionally included or excluded using the following macros:</P>
<PRE>
!if condition
!elsif condition
!else
!endif
</PRE>
<P>These macros allow you to tune the output for different audiences. For example, you may wish to only include email directions if <A HREF="http://www.w3.org/hypertext/WWW/MarkUp/">HTML</A> is being generated:</P>
<PRE>
!if OPT_PP_HTML
Click {{[jump="mailto:joe"] here}} to send me email.
!endif
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<STRONG>Note: </STRONG></P>
<OL>
<LI><EM>elseif</EM> can be used instead of <A HREF="../ref/melsif.html">elsif</A> if you prefer.
<LI><EM>condition</EM> is an <EM>SDF expression</EM> where unknown variables do not give errors
<LI>Conditional text blocks must be fully defined within a given file. This prevents an <A HREF="../ref/mif.html">if</A> macro within an included file excluding text in the file doing the including.</OL>
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