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="2006summer_member_whitney.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="381" ns="6" title="File:2006 eclipse award2.jpg">
        <duplicatefiles>
          <df name="2006autumn_artist.jpg" user="Farscout" timestamp="2008-02-26T05:25:08Z" />
        </duplicatefiles>
      </page>
      <page pageid="400" ns="6" title="File:2006autumn artist.jpg">
        <duplicatefiles>
          <df name="2006_eclipse_award2.jpg" user="Farscout" timestamp="2008-02-26T04:50:43Z" />
        </duplicatefiles>
      </page>
      <page pageid="382" ns="6" title="File:2006autumn member.jpg" />
      <page pageid="383" ns="6" title="File:2006autumn writer.jpg" />
      <page pageid="384" ns="6" title="File:2006movie award01.jpg" />
      <page pageid="385" ns="6" title="File:2006movie award02.jpg" />
      <page pageid="386" ns="6" title="File:2006movie award03.jpg" />
      <page pageid="378" ns="6" title="File:2006summer artist.jpg">
        <duplicatefiles>
          <df name="2006summer_artist_rachel.jpg" user="Farscout" timestamp="2008-02-26T04:09:26Z" />
        </duplicatefiles>
      </page>
      <page pageid="373" ns="6" title="File:2006summer artist rachel.jpg">
        <duplicatefiles>
          <df name="2006summer_artist.jpg" user="Farscout" timestamp="2008-02-26T04:48:56Z" />
        </duplicatefiles>
      </page>
      <page pageid="379" ns="6" title="File:2006summer member.jpg">
        <duplicatefiles>
          <df name="2006summer_member_whitney.jpg" user="Farscout" timestamp="2008-02-26T04:09:52Z" />
        </duplicatefiles>
      </page>
    </pages>
  </query>
</api>