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="2107" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <revisions>
          <rev user="Jadewik" timestamp="2006-05-17T20:01:33Z" comment="/* Quick Start Guide: */" />
          <rev user="Curulan" timestamp="2006-05-18T03:00:48Z" comment="" />
          <rev user="Curulan" timestamp="2006-05-18T03:01:09Z" comment="/* = on either side of text creates sub heading (or use cap/bold/tall A button to create it). Adding another */" />
          <rev user="Curulan" timestamp="2006-05-18T03:01:31Z" comment="/* Quick Start Guide: */" />
          <rev user="Curulan" timestamp="2006-05-18T03:01:58Z" comment="/* Quick Start Guide: */" />
        </revisions>
      </page>
    </pages>
  </query>
</api>