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="No_Center.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="135" ns="6" title="File:Canvas.jpg" />
      <page pageid="142" ns="6" title="File:Center Center.jpg" />
      <page pageid="143" ns="6" title="File:Center Center Job.jpg" />
      <page pageid="133" ns="6" title="File:Intro to BeagleBone Workshop.pdf" />
      <page pageid="147" ns="6" title="File:Laser Location.jpg" />
      <page pageid="138" ns="6" title="File:Left Center.jpg" />
      <page pageid="139" ns="6" title="File:Left Center Job.jpg" />
      <page pageid="129" ns="6" title="File:Loonie.svg" />
      <page pageid="24" ns="6" title="File:Makerbot.jpg" />
      <page pageid="9" ns="6" title="File:Mod Lab- Flowerpot Grill.png" />
    </pages>
  </query>
</api>