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="Button_Regeln" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Backend filterwiz" missing="" />
      <page ns="0" title="Backend tabletree" missing="" />
      <page ns="0" title="Benutzerfunktionen" missing="" />
      <page ns="0" title="Benutzerverwaltung" missing="" />
      <page pageid="889" ns="0" title="BOM Checker" />
      <page pageid="964" ns="0" title="Backboneit navigation" />
      <page pageid="250" ns="0" title="BackupDB" />
      <page pageid="245" ns="0" title="Banner" />
      <page pageid="504" ns="0" title="Banner Update v1 auf v2" />
      <page pageid="247" ns="0" title="Bot Detection" />
    </pages>
  </query>
</api>