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="Creating_levels" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="88" ns="0" title="Bitfighter Wikipedia Submission" />
      <p pageid="91" ns="0" title="Buglist 016" />
      <p pageid="5" ns="0" title="Building Bitfighter" />
      <p pageid="107" ns="0" title="Change the delay time for teleporters" />
      <p pageid="7" ns="0" title="Command line parameters" />
      <p pageid="110" ns="0" title="Contest checklist" />
      <p pageid="81" ns="0" title="Contribute using Mercurial" />
      <p pageid="9" ns="0" title="Contributors/Credits" />
      <p pageid="37" ns="0" title="Creating Bot NavZones to help bots navigate" />
      <p pageid="42" ns="0" title="Creating hostile objects" />
    </allpages>
  </query>
</api>