title: Using rendered with JSF
body: <p>How does <code>rendered</code> work? It hides <code>h:form</code> content completely and does not show it if <code>expression.list</code> is not empty.</p>
  
  <pre><code>&lt;h:form id="stackForm" rendered="#{not empty expression.list}"&gt; 
     &lt;p:orderList  id="stack" value="#{expression.list}"...
     ...
  </code></pre>