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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-continue>
    <revisions rvcontinue="760" />
  </query-continue>
  <query>
    <pages>
      <page pageid="57" ns="0" title="Main Page">
        <revisions>
          <rev user="DavidMRDSpencer" timestamp="2010-08-26T16:23:18Z" comment="Created page with &quot;&lt;big&gt;&#039;&#039;&#039;Welcome to David Spencer&#039;s Faith Foundation&#039;&#039;&#039;&lt;/big&gt;&lt;br&gt; {{Template:Menu}}  ==Purpose== &#039;&#039;&#039;David Spencer&#039;s Faith Foundation&#039;&#039;&#039; is an online journal of [[David M.R.D.Spenc…&quot;" />
          <rev user="DavidMRDSpencer" timestamp="2010-08-26T16:24:02Z" comment="moved [[Index.php]] to [[Main Page]]" />
          <rev user="DavidMRDSpencer" timestamp="2011-09-17T20:53:14Z" comment="" />
          <rev user="DavidMRDSpencer" timestamp="2012-07-11T00:08:16Z" comment="/* Visit Now */" />
          <rev user="DavidMRDSpencer" timestamp="2014-02-17T17:41:32Z" comment="" />
        </revisions>
      </page>
    </pages>
  </query>
</api>