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="1407" ns="0" title="Code Craking 2009" />
      <page pageid="2385" ns="0" title="Chi Wha &quot;Bronson&quot; Yung" />
      <page pageid="2438" ns="0" title="CSI Adelaide: Was Travon Martin murdered?" />
      <page pageid="2444" ns="0" title="Semester A Progress Report 2013" />
      <page pageid="4063" ns="0" title="Draft Report" />
    </pages>
  </query>
</api>