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="2753" ns="0" title="Change management" />
      <page pageid="3316" ns="0" title="Early like one 80 price drop 5 months after release ZING 56" />
      <page pageid="3723" ns="0" title="Text S P Rates Newcrest Mining Ltd BBB Outlook Stable Reuters 26" />
      <page pageid="5825" ns="0" title="Java Script Object Notation (JSON)" />
    </pages>
  </query>
</api>