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>
    <pages>
      <page pageid="343" ns="0" title="Bonecam 3" />
      <page pageid="42" ns="0" title="Cryogenic Cooling for Microwave Frontends" />
      <page pageid="135" ns="0" title="Digital Video Transmission" />
      <page pageid="24" ns="0" title="GRAPT" />
      <page pageid="228" ns="0" title="Gstreamer cheat sheet" />
      <page pageid="252" ns="0" title="High quality screen capture with Ffmpeg" />
      <page pageid="244" ns="0" title="Logitech HD Pro Webcam C910" />
      <page pageid="38" ns="0" title="Mobile Radio Control Panel" />
      <page pageid="98" ns="0" title="Receiving LRO and LCROSS" />
      <page pageid="259" ns="0" title="Simple DVB with Gstreamer and GNU Radio" />
    </pages>
  </query>
</api>