title: Java XStream - Ignore tag that doesn't exist in XML
body: <p>I currently use a piece of XML like the following</p>
  
  <pre><code>&lt;Person&gt;
      &lt;Name&gt;Frank Smith&lt;/Name&gt;
      &lt;Id&gt;100023412&lt;/Id&gt;
      &lt;DOB&gt;12/05/1954&lt;/DOB&gt;
      &lt;LasLogin&gt;01/09/2010&lt;/LasLogin&gt;
      &lt;FavOS&gt;Windows&lt;/FavOS&gt;      // Wild card that may occasionally appear
  &lt;/Person&gt;
  </code></pre>
  
  <p>What I am stuck with, is when using XStream I need to be able to ignore certain tags that appear (in the case above 'FavOS') 
  These tags may not be known or change in the future. Is there a way to Ignore all tags that do not match what is currently implemented?</p>
  
  <p>(Using XStream 1.3.1)</p>