You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allimages gaifrom="Arduino316.jpg" />
  </query-continue>
  <query>
    <pages>
      <page ns="6" title="File:1275632356403.gif" missing="" />
      <page ns="6" title="File:1275641442654.gif" missing="">
        <duplicatefiles>
          <df name="Prince.gif" user="Maintenance script" timestamp="2012-05-08T18:27:49Z" />
        </duplicatefiles>
      </page>
      <page ns="6" title="File:1275646304714.gif" missing="" />
      <page ns="6" title="File:1275679130660.gif" missing="" />
      <page ns="6" title="File:1285709592377.gif" missing="" />
      <page ns="6" title="File:Allthecake.png" missing="" />
      <page pageid="16989" ns="6" title="File:100 8657.JPG" />
      <page pageid="16990" ns="6" title="File:100 8660.JPG" />
      <page pageid="16988" ns="6" title="File:100 8662.JPG" />
      <page pageid="118" ns="6" title="File:Amateur.png" />
    </pages>
  </query>
</api>