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-continue>
    <revisions rvcontinue="27939" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <revisions>
          <rev user="Ikzelf" timestamp="2014-03-18T10:48:56Z" comment="" />
          <rev user="Ikzelf" timestamp="2014-03-18T10:48:36Z" comment="Starting out with some small modifications and fixes to the main page" />
          <rev user="DigitalSoju" timestamp="2013-09-18T06:16:44Z" comment="" />
          <rev user="DigitalSoju" timestamp="2013-04-12T05:50:59Z" comment="Add TTMIK image" />
          <rev user="DigitalSoju" timestamp="2012-12-11T02:32:12Z" comment="Fixed image map" />
        </revisions>
      </page>
    </pages>
  </query>
</api>