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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>
    <pages>
      <page pageid="310" ns="0" title="Main Page">
        <revisions>
          <rev user="Admin" timestamp="2011-07-02T03:15:24Z" comment="An inconsequential edit that is actually just intended to make sure the word &quot;role-playing&quot; appears somewhere on all our important pages. We be trollin&#039; for Google, yo." />
          <rev user="Admin" timestamp="2011-03-29T01:12:58Z" comment="Apparently, some people out there didn&#039;t know that we were an RP website, and thought we were just a wiki... Gonna have to remedy this." />
          <rev user="Admin" timestamp="2010-08-08T19:20:24Z" comment="" />
          <rev user="Admin" timestamp="2010-08-08T19:16:54Z" comment="Finally making the front page a little more useful." />
          <rev user="Admin" timestamp="2010-05-01T16:12:47Z" comment="Protected &quot;[[Main Page]]&quot; [edit=sysop:move=sysop]" />
        </revisions>
      </page>
    </pages>
  </query>
  <query-continue>
    <revisions rvcontinue="1955" />
  </query-continue>
</api>