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="Crq|206" />
  </query-continue>
  <query>
    <pages>
      <page pageid="69" ns="0" title="Multivan T5" />
      <page pageid="76" ns="0" title="Fourgon T5" />
      <page pageid="77" ns="0" title="Pick-up T5" />
      <page pageid="78" ns="0" title="California T5" />
      <page pageid="86" ns="0" title="Combi T5" />
      <page pageid="87" ns="0" title="Caravelle T5" />
      <page pageid="197" ns="0" title="Forums" />
      <page pageid="199" ns="0" title="Sites de référence" />
      <page pageid="200" ns="0" title="Documentation technique" />
      <page pageid="204" ns="0" title="Aménagement: fabricant de matériels" />
    </pages>
  </query>
</api>