title: find xml node by inner text in xml document
body: <p>how can i retrieve node out of xml document by inner text.
  for example </p>
  
  <pre><code> &lt;w:t&gt;WARNING&lt;/w:t&gt;
  </code></pre>
  
  <p>node consists multiple times with different values in xml document.
  I want to retrieve only those w:t nodes with inner text contains "WARNING" . </p>
  
  <p>how can it be done?</p>