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>
    <alllinks>
      <l ns="0" title="Carnaval" />
      <l ns="0" title="Cinquième primaire" />
      <l ns="0" title="Deuxième maternelle" />
      <l ns="0" title="Deuxième primaire" />
      <l ns="0" title="Garderie" />
      <l ns="0" title="Langues" />
      <l ns="0" title="Mise en page" />
      <l ns="0" title="Mycalendar 2013 10 1" />
      <l ns="0" title="Mycalendar 2013 10 10" />
      <l ns="0" title="Mycalendar 2013 10 11" />
    </alllinks>
  </query>
  <query-continue>
    <alllinks alcontinue="Mycalendar_2013_10_12" />
  </query-continue>
</api>