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="Chris_Duffys_subtask_to_move" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="7" ns="0" title="Basic Task States" />
      <p pageid="369" ns="0" title="Beverly Wemple" />
      <p pageid="684" ns="0" title="Brian Wee" />
      <p pageid="1373" ns="0" title="Cayelan Carey" />
      <p pageid="1365" ns="0" title="Cayelan Careys learned renaming tasks" />
      <p pageid="1368" ns="0" title="Cayelan Careys subtask to move" />
      <p pageid="1362" ns="0" title="Cayelan Careys task alert" />
      <p pageid="1367" ns="0" title="Cayelan Careys task to move" />
      <p pageid="1517" ns="0" title="Chris Duffy" />
      <p pageid="1515" ns="0" title="Chris Duffys subtask to delete" />
    </allpages>
  </query>
</api>