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="64" ns="0" title="Yoshi" />
      <page pageid="935" ns="0" title="Other Notable Guests" />
      <page pageid="954" ns="0" title="Maury Showbizawitz aka Joey" />
      <page pageid="972" ns="0" title="Sensitive artist" />
      <page pageid="996" ns="0" title="The funnier oil brother" />
      <page pageid="1027" ns="0" title="Fuckface" />
      <page pageid="1091" ns="0" title="Mark Spielger" />
      <page pageid="1220" ns="0" title="Melissa stetten" />
      <page pageid="1345" ns="0" title="Theme songs" />
      <page pageid="1824" ns="0" title="Dealing With Diabetes" />
    </pages>
  </query>
</api>