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="61" ns="0" title="Frequently Asked Questions" />
      <page pageid="14" ns="0" title="Main Page/Multiple RGB Cameras" />
      <page pageid="62" ns="0" title="Multiple Depth Sensors vs Web Cameras vs Action Cameras Comparison" />
      <page pageid="318" ns="0" title="PlayStation Move with Motion in Joy drivers" />
      <page pageid="217" ns="0" title="Sample Video and Project (single depth sensor)" />
      <page pageid="216" ns="0" title="Sample Video and Project (two depth sensors)" />
      <page pageid="372" ns="0" title="iPi Automation Add-on" />
    </pages>
  </query>
</api>