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>
    <allfileusages gafcontinue="Calibration2.jpg|185" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page" />
      <page pageid="31" ns="0" title="Main Page/Pro Edition Exclusive Features" />
      <page pageid="38" ns="0" title="iPi Recorder" />
      <page pageid="42" ns="0" title="iPi Mocap Studio" />
      <page pageid="185" ns="0" title="User Guide for Multiple PS Eye Cameras Configuration" />
      <page pageid="205" ns="0" title="Multiple PS Eye Cameras Calibration" />
    </pages>
  </query>
</api>