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="Lemke.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="114" ns="6" title="File:Assb banner 2.png" />
      <page pageid="121" ns="6" title="File:CNLS logo ASSB.jpg" />
      <page pageid="65" ns="6" title="File:Chakraborty.jpg" />
      <page pageid="66" ns="6" title="File:Chakraborty.png" />
      <page pageid="52" ns="6" title="File:Chakrabroty.jpg">
        <duplicatefiles>
          <df name="Wikswo-cv.doc" user="Nemenman" timestamp="2008-08-23T04:48:10Z" />
        </duplicatefiles>
      </page>
      <page pageid="128" ns="6" title="File:Foe portrait.jpg" />
      <page pageid="107" ns="6" title="File:Illustration OdellFoe.jpg" />
      <page pageid="109" ns="6" title="File:Illustration wilson.jpg" />
      <page pageid="78" ns="6" title="File:Kenyon.jpg" />
      <page pageid="127" ns="6" title="File:LANL logo ASSB.jpg" />
    </pages>
  </query>
</api>