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="Cosmeq.jpeg|165" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page" />
      <page pageid="48" ns="0" title="KMotion Libraries - GCode Interpreter - Trajectory Planner - Coordinated Motion - .NET" />
      <page pageid="64" ns="0" title="Backlash Compensation" />
      <page pageid="128" ns="0" title="How to convert a milling machine to a 3D printer in 3 easy steps" />
      <page pageid="130" ns="0" title="KMotionCNC Screen Editor" />
      <page pageid="236" ns="0" title="Linear Table Correction" />
    </pages>
  </query>
</api>