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="Bien-débuter-avec-OpenFlyers|2114" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1997" ns="0" title="Comptabilité" />
      <page pageid="2008" ns="0" title="FAQ client" />
      <page pageid="2039" ns="0" title="Créer une plateforme OpenFlyers pour sa structure" />
      <page pageid="2090" ns="0" title="Écritures comptables" />
      <page pageid="2091" ns="0" title="Introduction" />
      <page pageid="2092" ns="0" title="Bien débuter avec OpenFlyers" />
      <page pageid="2183" ns="0" title="Documentation utilisateur" />
      <page pageid="2222" ns="0" title="Gestion des rapports" />
      <page pageid="2510" ns="0" title="Accueil" />
    </pages>
  </query>
</api>