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="Das_Auswahlaxiom_-_Lorenz_Halbeisen_-_2016|18" />
  </query-continue>
  <query>
    <pages>
      <page pageid="17" ns="0" title="Spring Semester 2016" />
      <page pageid="18" ns="0" title="Elective Courses - Spring Semester 2016 - Bachelor" />
      <page pageid="62" ns="0" title="Spring Semester 2017" />
      <page pageid="76" ns="0" title="Autumn Semester 2018" />
      <page pageid="80" ns="0" title="Autumn Semester 2017" />
      <page pageid="83" ns="0" title="Spring Semester 2018" />
      <page pageid="100" ns="0" title="Spring Semester 2019" />
      <page pageid="111" ns="0" title="Autumn Semester 2019" />
      <page pageid="115" ns="0" title="Spring Semester 2020" />
    </pages>
  </query>
</api>