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>
    <alltransclusions gatcontinue="BTS|11808" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1644" ns="0" title="Creative Artists Agency" />
      <page pageid="1658" ns="0" title="New York Film Academy" />
      <page pageid="2317" ns="0" title="Hailstone Photography" />
      <page pageid="4039" ns="0" title="Lonelygirl15 behind the scenes" />
      <page pageid="4596" ns="0" title="Kenneth Goodfried" />
      <page pageid="8404" ns="0" title="Kira Lobenstein" />
      <page pageid="8912" ns="0" title="KateModern behind the scenes" />
      <page pageid="11682" ns="0" title="Miles Beckett" />
      <page pageid="11685" ns="0" title="Greg Goodfried" />
      <page pageid="11686" ns="0" title="Amanda Goodfried" />
    </pages>
  </query>
</api>