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="1730" ns="0" title="Remove Thunderbird mail folders" />
      <page pageid="1554" ns="0" title="Toyota car fax" />
      <page pageid="1825" ns="0" title="Unschooling" />
      <page pageid="1767" ns="0" title="Upgrade to Maverick" />
      <page pageid="1" ns="0" title="Welcome to finninday.net" />
      <page pageid="1792" ns="0" title="Xymon custom graph config" />
    </pages>
  </query>
</api>