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="20130129230343" timestamp="2013-01-29T23:03:43Z" ns="0" title="Calendar help" />
        <page value="20130130203633" timestamp="2013-01-30T20:36:33Z" ns="0" title="Mycalendar 2013 2 11" />
        <page value="20130203233720" timestamp="2013-02-03T23:37:20Z" ns="0" title="Bilbiotheque.jpg" />
        <page value="20130205221923" timestamp="2013-02-05T22:19:23Z" ns="0" title="Calendriers" />
        <page value="20130217165251" timestamp="2013-02-17T16:52:51Z" ns="0" title="Cinquième primaire" />
        <page value="20130217165329" timestamp="2013-02-17T16:53:29Z" ns="0" title="Troisième maternelle" />
        <page value="20130217165358" timestamp="2013-02-17T16:53:58Z" ns="0" title="Troisième primaire" />
        <page value="20130217165428" timestamp="2013-02-17T16:54:28Z" ns="0" title="Deuxième primaire" />
        <page value="20130220071504" timestamp="2013-02-20T07:15:04Z" ns="0" title="Contact" />
        <page value="20130220072145" timestamp="2013-02-20T07:21:45Z" ns="0" title="Mise en page" />
      </results>
    </querypage>
  </query>
  <query-continue>
    <querypage qpoffset="10" />
  </query-continue>
</api>