You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <allpages>
      <p pageid="148" ns="0" title="Cinquième atelier" />
      <p pageid="266" ns="0" title="Deuxième atelier" />
      <p pageid="290" ns="0" title="Huitième atelier" />
      <p pageid="333" ns="0" title="Neuvième atelier" />
      <p pageid="5" ns="0" title="Premier atelier" />
      <p pageid="130" ns="0" title="Quatrième atelier" />
      <p pageid="2" ns="0" title="Ressources bibliographiques" />
      <p pageid="3" ns="0" title="Ressources internet" />
      <p pageid="6" ns="0" title="Second atelier" />
      <p pageid="232" ns="0" title="Septième atelier" />
    </allpages>
  </query>
  <query-continue>
    <allpages apfrom="Sixième atelier" />
  </query-continue>
</api>