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>
  <warnings>
    <main xml:space="preserve">Unrecognized parameter: '*'</main>
  </warnings>
  <query-continue>
    <revisions rvcontinue="4723" />
  </query-continue>
  <query>
    <pages>
      <page pageid="413" ns="0" title="Main Page">
        <revisions>
          <rev user="AfterLifeLochie" timestamp="2013-07-06T22:05:07Z" comment="Typo - remove incorrect apostrophe" />
          <rev user="AfterLifeLochie" timestamp="2013-05-24T19:16:12Z" comment="Back to the pre-rollback design (fix display issues for 800x and 1024x screens, mobile compat.)" />
          <rev user="AfterLifeLochie" timestamp="2013-05-23T16:15:26Z" comment="Added MFR =&gt; mp-row: first. (I redesigned this before the server rollback, D:&lt;)" />
          <rev user="AfterLifeLochie" timestamp="2013-04-08T21:44:11Z" comment="Rearranging mp-row: second navigation to (try and) assist navigation." />
          <rev user="AfterLifeLochie" timestamp="2013-01-26T14:30:23Z" comment="Rearrange elements (&amp; iPad fix), add links to forum category for wiki, add more intralinks." />
        </revisions>
      </page>
    </pages>
  </query>
</api>