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="20131022075148" timestamp="2013-10-22T07:51:48Z" ns="0" title="Quick Guide to Using a Wiki" />
        <page value="20131125123150" timestamp="2013-11-25T12:31:50Z" ns="0" title="Centre for Water Research" />
        <page value="20131125124000" timestamp="2013-11-25T12:40:00Z" ns="0" title="University of Wisconsin - Madison" />
        <page value="20131125124153" timestamp="2013-11-25T12:41:53Z" ns="0" title="Pennsylvania State University" />
        <page value="20131125125918" timestamp="2013-11-25T12:59:18Z" ns="0" title="Center For Limnology" />
        <page value="20131125130949" timestamp="2013-11-25T13:09:49Z" ns="0" title="Information Sciences Institute" />
        <page value="20131125131019" timestamp="2013-11-25T13:10:19Z" ns="0" title="University of Southern California" />
        <page value="20131125131244" timestamp="2013-11-25T13:12:44Z" ns="0" title="Michigan State University" />
        <page value="20131203192206" timestamp="2013-12-03T19:22:06Z" ns="0" title="Lake OC Code" />
        <page value="20131203192733" timestamp="2013-12-03T19:27:33Z" ns="0" title="Lake OC in R" />
      </results>
    </querypage>
  </query>
</api>