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="Back2hack_black.png|8936" />
  </query-continue>
  <query>
    <pages>
      <page pageid="188" ns="0" title="Termin:Frühjahres Trainingslager der Lockpicker" />
      <page pageid="3116" ns="0" title="Termin:GUUG Vortrag: Einheitliches Austauschformat verschiedener IDS" />
      <page pageid="7748" ns="0" title="Termin:Back to Hack 2012-10-23" />
      <page pageid="7883" ns="0" title="Termin:Back to Hack 2012-10-30" />
      <page pageid="8348" ns="0" title="Termin:Back to Hack 2012-11-06" />
      <page pageid="13820" ns="0" title="RGB Moodlight" />
      <page pageid="14690" ns="0" title="Lasercutter" />
    </pages>
  </query>
</api>