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>
    <allredirects>
      <r ns="0" title="Frequently Asked Questions" />
      <r ns="0" title="Main Page/Multiple RGB Cameras" />
      <r ns="0" title="Multiple Depth Sensors vs Web Cameras vs Action Cameras Comparison" />
      <r ns="0" title="PlayStation Move with Motion in Joy drivers" />
      <r ns="0" title="Sample Video and Project (single depth sensor)" />
      <r ns="0" title="Sample Video and Project (two depth sensors)" />
      <r ns="0" title="iPi Automation Add-on" />
    </allredirects>
  </query>
</api>