title: change value of element by xquery
body: <pre><code>&lt;category&gt;
       &lt;catid&gt;1&lt;/catid&gt;
       &lt;cattext&gt; sport &lt;/cattext&gt;
  &lt;/category&gt;
  </code></pre>
  
  <p>I want change text of element <code>&lt;cattext&gt;</code> into another like "art" instead of sport by using xquery</p>