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>
    <allfileusages gafcontinue="Bild1.jpg|3782" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2271" ns="0" title="Verein" />
      <page pageid="4310" ns="0" title="XML-Export, Bestand Badischer Schwimmverband" />
      <page pageid="8017" ns="0" title="Was war im Jahr 2016 aktuell?" />
      <page pageid="8024" ns="0" title="Objekte des Monats im Jahr 2016" />
      <page pageid="8115" ns="0" title="Was war im Jahr 2020 aktuell?" />
      <page pageid="8171" ns="0" title="Was war im Jahr 2022 aktuell?" />
    </pages>
  </query>
</api>