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="Benutzerverwaltung|346" />
  </query-continue>
  <query>
    <pages>
      <page pageid="90" ns="0" title="Catalog Merkzettel erstellen" />
      <page pageid="245" ns="0" title="Banner" />
      <page pageid="303" ns="0" title="Xampp Multidomain" />
      <page pageid="346" ns="0" title="Aktionsbereiche" />
      <page pageid="483" ns="0" title="XNavigation" />
      <page pageid="504" ns="0" title="Banner Update v1 auf v2" />
      <page pageid="758" ns="0" title="UTF-8 ohne BOM" />
      <page pageid="773" ns="0" title="Contao2Go" />
    </pages>
  </query>
</api>