title: Can't select nodes in XML document
body: <p>My XML document is the <strong>Corpus.xml</strong> file in the <a href="http://nltk.googlecode.com/svn/trunk/nltk_data/packages/corpora/brown_tei.zip" rel="nofollow">TEI XML Brown Corpus</a></p>
  
  <p>I want to select every <code>s</code> node in the document, so I can iterate over them and extract data.</p>
  
  <p>The problem is that no matter which method I try, I cannot select the <code>s</code> nodes! I've tried: </p>
  
  <ul>
  <li><code>xml.Root.Descendants("s")</code></li>
  <li><code>xml.Root.XPathSelectElements("s")</code></li>
  <li><code>XPathDocument</code></li>
  </ul>
  
  <p>But nothing works. I get no errors. The result returned is an empty set!</p>