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 apcontinue="EUCD:_Best_Practices" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="976" ns="0" title="Bisherige Projekte" />
      <p pageid="1001" ns="0" title="Brainstorm 2. Juni" />
      <p pageid="996" ns="0" title="Brainstorm 30. Mai" />
      <p pageid="942" ns="0" title="Brazil" />
      <p pageid="962" ns="0" title="Confirmed Speakers" />
      <p pageid="946" ns="0" title="Creative Commons" />
      <p pageid="961" ns="0" title="Current events" />
      <p pageid="952" ns="0" title="Debian - Ubuntu - Gentoo" />
      <p pageid="948" ns="0" title="Die Show des Freien Wissens" />
      <p pageid="1028" ns="0" title="Dispo der Logos Partner" />
    </allpages>
  </query>
</api>