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>
    <allfileusages gafcontinue="Culture_Reptants_(base)_-_16_décembre_2012.png|797" />
  </query-continue>
  <query>
    <pages>
      <page pageid="69" ns="0" title="Points de contrôle" />
      <page pageid="314" ns="0" title="Classements" />
      <page pageid="473" ns="0" title="News - 16 juillet 2012" />
      <page pageid="503" ns="0" title="Battle Arenas Chronicles" />
      <page pageid="505" ns="0" title="Sacrifice (Battle Arenas Chronicles)" />
      <page pageid="701" ns="0" title="News - 25 novembre 2012" />
      <page pageid="797" ns="0" title="News - 21 décembre 2012" />
    </pages>
  </query>
</api>