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>
    <pages>
      <page pageid="265" missing="" />
      <page pageid="263" ns="0" title="Schiftzeichenfalsch Youtube" />
      <page pageid="264" ns="0" title="TS3MusicBot Hoster API" />
      <page pageid="266" ns="0" title="Hoster API EN" />
      <page pageid="327" ns="0" title="Make sure to save a query login and password" />
      <page pageid="340" ns="0" title="Welche Webinterfaces Laufen mit dem Musicbot" />
      <page pageid="342" ns="0" title="MusicBot installieren" />
      <page pageid="345" ns="0" title="Channel Switch" />
    </pages>
  </query>
</api>