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="9009-3Rearseat-1.jpg" />
  </query-continue>
  <query>
    <pages>
      <page ns="6" title="File:7-Keto DHEA 2763.jpg" missing="" />
      <page pageid="172576" ns="6" title="File:2008 Saab 9-3.jpeg" />
      <page pageid="560" ns="6" title="File:2 door saloon.jpg" />
      <page pageid="558" ns="6" title="File:3 door coupe.jpg" />
      <page pageid="559" ns="6" title="File:4 door saloon.jpg" />
      <page pageid="286" ns="6" title="File:4cyl lump large.gif" />
      <page pageid="287" ns="6" title="File:6cyl lump large.gif" />
      <page pageid="617" ns="6" title="File:9-3 Exhaust 1.jpg" />
      <page pageid="619" ns="6" title="File:9-3 Exhaust 2.jpg">
        <duplicatefiles>
          <df name="SportExhaust.jpg" user="Mbcullen" timestamp="2010-06-17T07:33:12Z" />
        </duplicatefiles>
      </page>
      <page pageid="621" ns="6" title="File:9-3 Forge BPV.jpg" />
    </pages>
  </query>
</api>