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="135396" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <revisions>
          <rev user="Rainwarrior" timestamp="2018-07-13T20:31:14Z" comment="/* Advanced Topics */ mv Visual C 2008 Express to Visual Studio" />
          <rev user="Wengier" timestamp="2016-06-29T02:55:19Z" comment="/* General Information */" />
          <rev user="Wengier" timestamp="2016-06-29T02:49:17Z" comment="" />
          <rev user="Wengier" timestamp="2016-06-29T02:26:30Z" comment="Arrange download links" />
          <rev user="Wengier" timestamp="2016-06-27T14:45:11Z" comment="/* Advanced Topics */ update links" />
        </revisions>
      </page>
    </pages>
  </query>
</api>