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="ADSL Gateway.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="44" ns="6" title="File:138 casework.jpg">
        <duplicatefiles>
          <df name="OpticalScan.jpg" user="Kopyloe" timestamp="2007-12-01T22:34:23Z" />
        </duplicatefiles>
      </page>
      <page pageid="723" ns="6" title="File:176px-XMPP Logo.svg.png" />
      <page pageid="38" ns="6" title="File:180px-User Account Control administrator dialog.png" />
      <page pageid="787" ns="6" title="File:20080923-spam-botnet.jpg" />
      <page pageid="790" ns="6" title="File:300 107540.gif" />
      <page pageid="87" ns="6" title="File:3dface.jpg" />
      <page pageid="867" ns="6" title="File:3gevolution.gif" />
      <page pageid="593" ns="6" title="File:800px-Web 2.0 Map.svg.png" />
      <page pageid="732" ns="6" title="File:ACS aet63.jpg" />
      <page pageid="437" ns="6" title="File:ADSL Frequencies.jpg" />
    </pages>
  </query>
</api>