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>
    <allredirects garcontinue="Canon_50D" />
  </query-continue>
  <query>
    <pages>
      <page pageid="440" ns="0" title="Canon 1D Mark II" />
      <page pageid="438" ns="0" title="Canon 1D Mark III" />
      <page pageid="439" ns="0" title="Canon 1D Mark II N" />
      <page pageid="314" ns="0" title="Canon 1D Mark IV" />
      <page pageid="312" ns="0" title="Canon 1D X" />
      <page pageid="437" ns="0" title="Canon 1Ds Mark II" />
      <page pageid="436" ns="0" title="Canon 1Ds Mark III" />
      <page pageid="446" ns="0" title="Canon 20D" />
      <page pageid="445" ns="0" title="Canon 30D" />
      <page pageid="444" ns="0" title="Canon 40D" />
    </pages>
  </query>
</api>