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="Plus_machina" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Digitalité-Blog" missing="" />
      <page pageid="183" ns="0" title="Citations de De Gaulle sur Pétain et vice-versa" />
      <page pageid="218" ns="0" title="EM:Abécédaire de la Complexité" />
      <page pageid="219" ns="0" title="EM:Crisologie" />
      <page pageid="225" ns="0" title="EM:programme MCX" />
      <page pageid="135" ns="0" title="La Monade agorique" />
      <page pageid="258" ns="0" title="La foi du Centurion scientifique" />
      <page pageid="209" ns="0" title="Notes lexicales : siècle, séculier, sécularisation" />
      <page pageid="223" ns="0" title="PC:Abécédaire de la Complexité" />
      <page pageid="224" ns="0" title="PC:Crisologie" />
    </pages>
  </query>
</api>