title: Same xml element in different places
body: <p>Is such xml valid?</p>
  
  <pre><code>&lt;xml&gt;
      &lt;foo/&gt;
      &lt;foo/&gt;
      &lt;bar/&gt;
      &lt;bar/&gt;
      &lt;foo/&gt;
      &lt;bar/&gt;
  &lt;/xml&gt;
  </code></pre>
  
  <p>If it this, how should JAXB mappings look like to keep such structure?(With mapping I have created all the foos goes into single list, same with bars); </p>