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"?>
    <alltransclusions gatcontinue="Burnable|1061" />
      <page pageid="1048" ns="0" title="User ideas" />
      <page pageid="1059" ns="0" title="Mr. IceBlock" />
      <page pageid="1060" ns="0" title="Mr. Bomb" />
      <page pageid="2561" ns="0" title="Electric eel" />
      <page pageid="2680" ns="1" title="Talk:Milestone 2 Design Document/Tasks" />
      <page pageid="2935" ns="0" title="February 14 Meeting Agenda" />
      <page pageid="2939" ns="2" title="User:Mattmccutchen/Bugs" />
      <page pageid="2946" ns="0" title="Meeting 2010-02-14" />
      <page pageid="2949" ns="0" title="February 20th Meeting Agenda" />
      <page pageid="2990" ns="0" title="Incubator Island" />