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>
    <querypage name="Ancientpages">
      <results>
        <page value="20070719041749" timestamp="2007-07-19T04:17:49Z" ns="0" title="Rule 34" />
        <page value="20070727102336" timestamp="2007-07-27T10:23:36Z" ns="0" title="Lolikon Angel" />
        <page value="20070820105218" timestamp="2007-08-20T10:52:18Z" ns="0" title="Sample movie article format" />
        <page value="20070824002456" timestamp="2007-08-24T00:24:56Z" ns="0" title="Akira Shirase" />
        <page value="20070919203036" timestamp="2007-09-19T20:30:36Z" ns="0" title="Kemono" />
        <page value="20071007062059" timestamp="2007-10-07T06:20:59Z" ns="0" title="List of doujinshi featuring loli characters" />
        <page value="20071008033155" timestamp="2007-10-08T03:31:55Z" ns="0" title="Mieow" />
        <page value="20071010035939" timestamp="2007-10-10T03:59:39Z" ns="0" title="Anata ga Oniichan" />
        <page value="20071012070931" timestamp="2007-10-12T07:09:31Z" ns="0" title="Archives" />
        <page value="20080129094048" timestamp="2008-01-29T09:40:48Z" ns="0" title="Loli (disambiguation)" />
      </results>
    </querypage>
  </query>
  <query-continue>
    <querypage qpoffset="10" />
  </query-continue>
</api>