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="Bonn-Kopenhagen.jpg|26" />
  </query-continue>
  <query>
    <pages>
      <page pageid="4" ns="0" title="Deutsche Minderheit in Dänemark" />
      <page pageid="5" ns="0" title="Knivsberg" />
      <page pageid="228" ns="0" title="Hans Heinrich Hansen (Apotheker)" />
      <page pageid="262" ns="0" title="Barbara Meyer" />
      <page pageid="393" ns="0" title="Bendix Brodersen" />
      <page pageid="443" ns="0" title="Birgit Mørck" />
      <page pageid="678" ns="0" title="Deutscher Jugendverband für Nordschleswig" />
      <page pageid="708" ns="0" title="Bund Deutscher Nordschleswiger" />
      <page pageid="930" ns="0" title="Bernd Søndergaard" />
    </pages>
  </query>
</api>