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>
    <alllinks galcontinue="Configurer_la_redirection_de_port_(Windows_Serveur_DNS)" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="BASICA" missing="" />
      <page ns="0" title="Berkeley Software Distribution" missing="" />
      <page ns="0" title="Blue hat" missing="" />
      <page ns="0" title="C sharp" missing="" />
      <page ns="0" title="Chess Titans" missing="" />
      <page ns="0" title="Code de la consommation" missing="" />
      <page ns="0" title="Common Internet File System" missing="" />
      <page ns="0" title="Compatible PC" missing="" />
      <page ns="0" title="Component Object Model" missing="" />
      <page pageid="2" ns="0" title="Configurer la redirection DNS (Windows Serveur DNS)" />
    </pages>
  </query>
</api>