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="20140928201943" timestamp="2014-09-28T20:19:43Z" ns="0" title="Stage" />
        <page value="20140928202859" timestamp="2014-09-28T20:28:59Z" ns="0" title="Candidature à une bourse de thèse" />
        <page value="20140928202937" timestamp="2014-09-28T20:29:37Z" ns="0" title="Ecoles Doctorales" />
        <page value="20140928203056" timestamp="2014-09-28T20:30:56Z" ns="0" title="ED 564" />
        <page value="20140928204445" timestamp="2014-09-28T20:44:45Z" ns="0" title="ED 515" />
        <page value="20140929070800" timestamp="2014-09-29T07:08:00Z" ns="0" title="Inscription en thèse" />
        <page value="20140929071137" timestamp="2014-09-29T07:11:37Z" ns="0" title="Réservation de salles" />
        <page value="20140929071224" timestamp="2014-09-29T07:12:24Z" ns="0" title="Soutenance" />
        <page value="20140929071412" timestamp="2014-09-29T07:14:12Z" ns="0" title="Séminaires jeunes" />
        <page value="20140929071450" timestamp="2014-09-29T07:14:50Z" ns="0" title="CESIL" />
      </results>
    </querypage>
  </query>
</api>