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="Beautyandthebeastsing.png|2740" />
  </query-continue>
  <query>
    <pages>
      <page pageid="14" ns="0" title="Fantasyland" />
      <page pageid="192" ns="0" title="The Country Bear Jamboree" />
      <page pageid="197" ns="0" title="Big Thunder Mountain Railroad" />
      <page pageid="305" ns="0" title="Liberty Square Riverboat" />
      <page pageid="1641" ns="0" title="Disney Junior- Live on Stage!" />
      <page pageid="1653" ns="0" title="Beauty and the Beast Live On Stage" />
      <page pageid="1839" ns="0" title="The Barnstormer Featuring Goofy as the Great Goofini" />
      <page pageid="1847" ns="0" title="Under the Sea: Journey of the Little Mermaid" />
      <page pageid="2485" ns="0" title="Backlot Express" />
    </pages>
  </query>
</api>