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>
  <query-continue>
    <querypage qpoffset="10" />
  </query-continue>
  <query>
    <querypage name="Ancientpages">
      <results>
        <page value="20130514221826" timestamp="2013-05-14T22:18:26Z" ns="0" title="RevisionHistory:Patch Notes 1-9" />
        <page value="20130515010325" timestamp="2013-05-15T01:03:25Z" ns="0" title="OgreConsole" />
        <page value="20130515013733" timestamp="2013-05-15T01:37:33Z" ns="0" title="OgreRequests" />
        <page value="20130517133116" timestamp="2013-05-17T13:31:16Z" ns="0" title="Main Page" />
        <page value="20130519121711" timestamp="2013-05-19T12:17:11Z" ns="0" title="RevisionHistory:Patch Notes 10-19" />
        <page value="20130524200330" timestamp="2013-05-24T20:03:30Z" ns="0" title="File list" />
        <page value="20130529214249" timestamp="2013-05-29T21:42:49Z" ns="0" title="Master Control Panel" />
        <page value="20130618170303" timestamp="2013-06-18T17:03:03Z" ns="0" title="Featurerequests" />
        <page value="20130620190828" timestamp="2013-06-20T19:08:28Z" ns="0" title="RevisionHistory" />
        <page value="20130620191010" timestamp="2013-06-20T19:10:10Z" ns="0" title="RevisionHistory:Patch Notes 20-29" />
      </results>
    </querypage>
  </query>
</api>