 blocks, like this:</span></p>
      <p class="ps15"><span class="ts4">[code] </span><span class="ts22">&lt;IF [NOT_]DEFINED_</span><span class="ts24">identifier</span><span class="ts22">&gt;</span><span class="ts4">&nbsp;code </span><span class="ts22">&lt;ELSE&gt;</span><span class="ts4">&nbsp;code </span><span class="ts22">&lt;/IF&gt;</span><span class="ts4">&nbsp;[code]</span></p>
      <h2 class="hd1"><span class="ts2">Nesting Conditional Processing Blocks</span></h2>
      <p class="ps2"><span class