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="CSH|4488" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1641" ns="0" title="Colvinisme" />
      <page pageid="1662" ns="0" title="Cercle des Indépendants" />
      <page pageid="2172" ns="0" title="Bloc National Helvetian" />
      <page pageid="2198" ns="0" title="Bloc Nationaliste Républicain" />
      <page pageid="2203" ns="0" title="Bloc Nationaliste Scanthélois" />
      <page pageid="2747" ns="0" title="Bloc Scanténois" />
      <page pageid="5808" ns="0" title="Internationale Merksiste" />
      <page pageid="6719" ns="0" title="Conseil Sportif Micromondial" />
      <page pageid="7277" ns="0" title="Classement CSM de Football" />
    </pages>
  </query>
</api>