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>
    <allpages apcontinue="MusicBot_installieren" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="345" ns="0" title="Channel Switch" />
      <p pageid="328" ns="0" title="Failed to start TS3MusicBot" />
      <p pageid="331" ns="0" title="Flood Ban" />
      <p pageid="1" ns="0" title="Hauptseite" />
      <p pageid="266" ns="0" title="Hoster API EN" />
      <p pageid="166" ns="0" title="How Ten Things Will Change The Way You Approach Http: therealdealz.com stardoll-hack-cheats-tool-2014" />
      <p pageid="344" ns="0" title="How to install TS3MusicBot (Windows Vbox)" />
      <p pageid="163" ns="0" title="Http: therealdealz.com stardoll-hack-cheats-tool-2014 Doesn t Have To Be Hard. Read These Six Tips" />
      <p pageid="326" ns="0" title="License expired" />
      <p pageid="327" ns="0" title="Make sure to save a query login and password" />
    </allpages>
  </query>
</api>