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 gapcontinue="Richtlinien_im_Wiki" />
  </query-continue>
  <query>
    <pages>
      <page pageid="60" ns="0" title="Reiseplan">
        <revisions>
          <rev contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">= '''Flugdaten''' =

{| class=&quot;wikitable&quot;
|- 
| W 61092|| [http://www.dortmund-airport.de  Flughafen Dortmund] || 21. Mai 08:15h || Kattowitz || 21. Mai 09:50h || '''06:45h im Flughafengebäude'''
|- 
| W 61097 || [http://www.katowice-airport.com/de Flughafen Kattowitz] || 28. Mai 15:30h || Dortmund || 28. Mai 17:05h ||
|}</rev>
        </revisions>
      </page>
      <page pageid="329" ns="0" title="Reiseplan 2012">
        <revisions>
          <rev contentformat="text/x-wiki" contentmodel="wikitext" xml:space="preserve">= '''Flugdaten''' =

{| class=&quot;wikitable&quot;
|- 
| W 61092|| [http://www.dortmund-airport.de  Flughafen Dortmund] || 18. Mai 08:30h || Kattowitz || 18. Mai 10:00h || '''07:00h im Flughafengebäude'''
|- 
| W 61097 || [http://www.katowice-airport.com/de Flughafen Kattowitz] || 26. Mai 15:30h || Dortmund || 26. Mai 17:05h ||
|}</rev>
        </revisions>
      </page>
    </pages>
  </query>
</api>