title: XML parsing in python: expaterror not well-formed
body: <p>I'm using Python's <code>xml.etree.ElementTree</code> to do some XML parsing on a file. However, I get this error mid-way through the document:</p>
  
  <pre><code>xml.parsers.expat.ExpatError: not well-formed (invalid token): line X, column Y
  </code></pre>
  
  <p>So I go to line X, column Y in vim and I see an ampersand (&amp;) with red background highlighting. What does this mean? </p>
  
  <p>Also the two characters preceding it are <code>&gt;&gt;</code>, so maybe there's something special about <code>&gt;&gt;&amp;</code>? </p>
  
  <p>Anyone know how to fix this? </p>