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="18" ns="0" title="ROS Core Tutorials" />
      <page pageid="442" ns="0" title="Critrs/prototype1" />
      <page pageid="443" ns="0" title="Critrs/pcb gen2" />
      <page pageid="444" ns="0" title="Critrs/pcb gen1" />
      <page pageid="445" ns="0" title="Critrs/motor control gen1" />
      <page pageid="447" ns="0" title="CRITR/prototype1" />
      <page pageid="448" ns="0" title="CRITR/Prototype 1/ARM" />
      <page pageid="452" ns="0" title="CRITR/Prototype 1/Arm and Arm controller" />
      <page pageid="453" ns="0" title="CRITR/Prototype 2/Arm Controller" />
      <page pageid="733" ns="0" title="ECE-370: Distance Sensor Hookup to uController" />
    </pages>
  </query>
</api>