You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <allpages>
      <p pageid="6" ns="0" title="Brug Firefox uden mus" />
      <p pageid="41" ns="0" title="Computernavne" />
      <p pageid="52" ns="0" title="Firefox udvidelser" />
      <p pageid="47" ns="0" title="Forklaring" />
      <p pageid="1" ns="0" title="Forside" />
      <p pageid="10" ns="0" title="Fysik 1" />
      <p pageid="16" ns="0" title="Fysik 1/Logbog uge 37" />
      <p pageid="17" ns="0" title="Fysik 1/Logbog uge 38" />
      <p pageid="12" ns="0" title="Fysik 1/Logbog uge 39" />
      <p pageid="11" ns="0" title="Fysik 1/Logbog uge 40" />
    </allpages>
  </query>
  <query-continue>
    <allpages apfrom="Fysik 1/Logbog uge 41" />
  </query-continue>
</api>