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="DNSBL" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="BIND9" missing="" />
      <page pageid="343" ns="0" title="Bind9" />
      <page pageid="315" ns="0" title="Chillispot" />
      <page pageid="323" ns="0" title="ClamAV" />
      <page pageid="299" ns="0" title="Commandes reseaux Linux" />
      <page pageid="300" ns="0" title="Configurer reseau Windows" />
      <page pageid="482" ns="0" title="Configurer reseau ubuntu" />
      <page pageid="64" ns="0" title="Contrôleur de domaine Windows Server 2003" />
      <page pageid="349" ns="0" title="CoovaChilli" />
      <page pageid="427" ns="0" title="DKIM Proxy" />
    </pages>
  </query>
</api>