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>
    <alllinks galcontinue="Dev200-accueilAboLettre.php" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Buffet de cuisine de mon enfance" missing="" />
      <page ns="0" title="Classes sociales" missing="" />
      <page pageid="481" ns="0" title="Cahier Le Je à l&#039;œuvre" />
      <page pageid="480" ns="0" title="Comptes rendus 2014 MPAPA" />
      <page pageid="479" ns="0" title="Comptes rendus 2015 MPAPA" />
      <page pageid="584" ns="0" title="Comptes rendus MPAPA" />
      <page pageid="952" ns="0" title="Comptes rendus des réunions MPAPA" />
      <page pageid="951" ns="0" title="Comptes rendus du groupe lecture" />
      <page pageid="135" ns="0" title="Dev-200-pannePartielle.html" />
      <page pageid="161" ns="0" title="Dev-200-sqlsi.infoChercheurs" />
    </pages>
  </query>
</api>