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="7516639 500 500 kzwm.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="4000" ns="6" title="Bestand:10.jpg" />
      <page pageid="3933" ns="6" title="Bestand:100policor.gif" />
      <page pageid="3921" ns="6" title="Bestand:100procent.gif" />
      <page pageid="3935" ns="6" title="Bestand:100procentjes.gif" />
      <page pageid="3796" ns="6" title="Bestand:14euro7nq.jpg" />
      <page pageid="3798" ns="6" title="Bestand:14minuten.jpg" />
      <page pageid="3968" ns="6" title="Bestand:246 4632.jpg" />
      <page pageid="3864" ns="6" title="Bestand:3fm darfur.gif" />
      <page pageid="2053" ns="6" title="Bestand:5d35c6809b3c.jpg" />
      <page pageid="4096" ns="6" title="Bestand:71759228.jpg" />
    </pages>
  </query>
</api>