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>
    <allredirects garcontinue="Pages_Personnelles|30" />
  </query-continue>
  <query>
    <pages>
      <page pageid="21" ns="0" title="Pour les CyberNuls" />
      <page pageid="27" ns="0" title="Liste d&#039;échanges" />
      <page pageid="28" ns="0" title="Liste de diffusion groupée" />
      <page pageid="33" ns="0" title="Mode d&#039;emploi" />
      <page pageid="151" ns="0" title="Netiquette" />
      <page pageid="160" ns="0" title="Trophées" />
      <page pageid="281" ns="0" title="Contributions" />
      <page pageid="306" ns="0" title="Interventions du BSI" />
      <page pageid="355" ns="0" title="Annuaire des adresses groupées" />
      <page pageid="361" ns="0" title="Cercles de réflexion" />
    </pages>
  </query>
</api>