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="20110222170158" timestamp="2011-02-22T17:01:58Z" ns="0" title="SquidGuard" />
        <page value="20110724004746" timestamp="2011-07-24T00:47:46Z" ns="0" title="Contrôleur de domaine Windows Server 2003" />
        <page value="20110818114019" timestamp="2011-08-18T11:40:19Z" ns="0" title="Linksys Provisioning" />
        <page value="20110902161324" timestamp="2011-09-02T16:13:24Z" ns="0" title="Webmin" />
        <page value="20111226145442" timestamp="2011-12-26T14:54:42Z" ns="0" title="WRT54GL" />
        <page value="20120115151203" timestamp="2012-01-15T15:12:03Z" ns="0" title="Portail Captif" />
        <page value="20120222000826" timestamp="2012-02-22T00:08:26Z" ns="0" title="WRT54GL DD-WRT" />
        <page value="20120222160250" timestamp="2012-02-22T16:02:50Z" ns="0" title="Configurer reseau Windows" />
        <page value="20120224135442" timestamp="2012-02-24T13:54:42Z" ns="0" title="Linksys AM200" />
        <page value="20120327071818" timestamp="2012-03-27T07:18:18Z" ns="0" title="Asterisk IAX" />
      </results>
    </querypage>
  </query>
</api>