You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <pages>
      <page pageid="3" ns="0" title="Main Page">
        <revisions>
          <rev user="Fehrmann" timestamp="2008-11-20T11:45:30Z" comment="New page: Dear visitor!  In this place we start to implement a reviewed scientific plattform for forest science and related topics (ForestScience-Wiki) to enlarge our academic offers to students and..." />
          <rev user="WikiSysop" timestamp="2008-11-20T11:51:40Z" comment="" />
          <rev user="WikiSysop" timestamp="2008-11-20T11:52:59Z" comment="Protected &quot;[[Main Page]]&quot;: Hauptseite soll nicht geändert werden! [edit=sysop:move=sysop]" />
          <rev user="WikiSysop" timestamp="2008-11-20T11:59:38Z" comment="" />
          <rev user="WikiSysop" timestamp="2008-11-21T13:28:15Z" comment="" />
        </revisions>
      </page>
    </pages>
  </query>
  <query-continue>
    <revisions rvstartid="44" />
  </query-continue>
</api>