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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>
    <querypage name="Ancientpages">
      <results>
        <page value="20120324115414" timestamp="2012-03-24T11:54:14Z" ns="0" title="Test" />
        <page value="20120413034004" timestamp="2012-04-13T03:40:04Z" ns="0" title="Main Page" />
      </results>
    </querypage>
  </query>
</api>