title: FaceletException: The value of attribute "value" associated with an element type "h:commandButton" must not contain the '<' character
body: <p>I tried to create a command button with value <code>&lt;&lt;</code>.</p>
  
  <pre><code>&lt;h:commandButton value="&lt;&lt;" /&gt;
  </code></pre>
  
  <p>However, it threw the following exception:</p>
  
  <blockquote>
    <p>javax.faces.view.facelets.FaceletException: Error Parsing /test.xhtml: Error Traced[line: 42] The value of attribute "value" associated with an element type "h:commandButton" must not contain the '&lt;' character.</p>
  </blockquote>
  
  <p>How do I create such a button?</p>