JDEGUEST / Apache2-SSI-v0.2.12 / t / htdocs / ssi / 03.01.if.html 
<!--#if expr=1 -->
 Hi, should print
<!--#else -->
 Shouldn't print
<!--#endif -->

<!--#if expr=1 -->
 Hi, should print
<!--#elif expr=1 -->
 Shouldn't print
<!--#else -->
 Shouldn't print
<!--#endif -->

<!--#if expr=0 -->
 Shouldn't print
<!--#elif expr=1 -->
 Hi, should print
<!--#else -->
 Shouldn't print
<!--#endif -->

<!--#if expr=0 -->
 Shouldn't print
<!--#elif expr=0 -->
 Shouldn't print
<!--#else -->
 Hi, should print
<!--#endif -->