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>
    <alltransclusions gatcontinue="Box|311" />
  </query-continue>
  <query>
    <pages>
      <page pageid="22" ns="0" title="Promo@en65.fr" />
      <page pageid="24" ns="0" title="BSI" />
      <page pageid="150" ns="0" title="RFC1855(FR)" />
      <page pageid="233" ns="0" title="Nos auteurs" />
      <page pageid="254" ns="0" title="ATP65:Le cinquième milieu opérationnel" />
      <page pageid="275" ns="0" title="Internet: un usage banal" />
      <page pageid="309" ns="0" title="Cercles de conflexion" />
      <page pageid="310" ns="0" title="Foire aux Questions" />
    </pages>
  </query>
</api>