    <p>
    <form class="search" action="search.html" method="get">
      <input type="text" name="q" size="18" /> <input type="submit" value="Search" />
      <input type="hidden" name="check_keywords" value="yes" />
      <input type="hidden" name="area" value="default" />
    </form>
    </p>

    </div>

    <div id="docs-body" class="withsidebar" >
        
<div class="section" id="defs-and-blocks">
<span id="defs-toplevel"></span><h1>Defs and Blocks<a class="headerlink" href="#defs-and-blocks" title="