You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allimages gaicontinue="AUS.gif" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2604" ns="6" title="Datei:(Jodi) Icon.jpg">
        <duplicatefiles>
          <df name="(Jodi)_Icon.jpg" user="Aelius" timestamp="2006-01-27T21:16:03Z" shared="" />
        </duplicatefiles>
      </page>
      <page pageid="3452" ns="6" title="Datei:1070654.jpg" />
      <page pageid="3154" ns="6" title="Datei:1345723727.jorinda charsheet myerel com1jorinda.png.jpg" />
      <page pageid="3233" ns="6" title="Datei:1375286961.keikoorca commi keiko small.jpg" />
      <page pageid="1753" ns="6" title="Datei:150px-BlackPawProductionsLogo.gif" />
      <page pageid="2628" ns="6" title="Datei:150px-YiffyToys Logo klein.png" />
      <page pageid="1749" ns="6" title="Datei:180px-Tris soldier.jpg" />
      <page pageid="3261" ns="6" title="Datei:38ea504d0e4f65d13e2e4b560dfbf5c5.jpg" />
      <page pageid="3343" ns="6" title="Datei:9531503379 2003bdae18 n.jpg" />
      <page pageid="2564" ns="6" title="Datei:AClogo-new.jpg">
        <duplicatefiles>
          <df name="AClogo-new.jpg" user="OckhamTheFox" timestamp="2008-12-05T02:37:02Z" shared="" />
          <df name="AClogo-new.jpg" user="BlueOtter" timestamp="2005-08-17T14:06:31Z" shared="" />
        </duplicatefiles>
      </page>
    </pages>
  </query>
</api>