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="Deutsche_Bahn/Strategie" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Bahnknoten München/Expertenrat" missing="" />
      <page ns="0" title="Bewertung in der Stresstest-Präsentation" missing="" />
      <page ns="0" title="Bibliothek 21/Expertenrat" missing="" />
      <page ns="0" title="Brenner Gutachten" missing="" />
      <page pageid="1629" ns="0" title="Bibliothek 21" />
      <page pageid="1630" ns="0" title="Bibliothek 21/Austattung Innen" />
      <page pageid="1631" ns="0" title="Bibliothek 21/Technik Innen" />
      <page pageid="388" ns="0" title="Deutsche Bahn" />
      <page pageid="1810" ns="0" title="Deutsche Bahn/Fremdsteuerung" />
      <page pageid="1813" ns="0" title="Deutsche Bahn/Netzwerk" />
    </pages>
  </query>
</api>