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="918" ns="1" title="Talk:Multimeans of Pi Series MA181Fall2008bell" />
      <page pageid="5174" ns="14" title="Category:ECE662 Old Kiwi" />
      <page pageid="5419" ns="0" title="About Kiwi Old Kiwi" />
      <page pageid="6184" ns="14" title="Category:ECE662 OldKiwi" />
      <page pageid="6429" ns="0" title="About Kiwi OldKiwi" />
      <page pageid="10486" ns="0" title="CRSP compustat merged database in WRDS" />
    </pages>
  </query>
</api>