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="Convert|184" />
  </query-continue>
  <query>
    <pages>
      <page pageid="50" ns="10" title="Template:Quotation/doc" />
      <page pageid="51" ns="10" title="Template:Quotation templates see also" />
      <page pageid="65" ns="10" title="Template:Infobox Disney ride" />
      <page pageid="88" ns="10" title="Template:Infobox Disney ride/doc" />
      <page pageid="107" ns="10" title="Template:Quotation" />
      <page pageid="170" ns="10" title="Template:Infobox amusement park" />
      <page pageid="184" ns="10" title="Template:Infobox amusement park/doc" />
    </pages>
  </query>
</api>