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="ItemJunk|569" />
      <page pageid="561" ns="0" title="Undecipherable Book" />
      <page pageid="562" ns="0" title="Broken Mace" />
      <page pageid="563" ns="0" title="Fake Chalice" />
      <page pageid="564" ns="0" title="Glass Pendant" />
      <page pageid="565" ns="0" title="Surplus Legion Helmet" />
      <page pageid="566" ns="0" title="Tanned Kriipa Leather" />
      <page pageid="567" ns="0" title="Scrap Metal" />
      <page pageid="568" ns="0" title="Bones of Konimas Original War Party" />
      <page pageid="906" ns="2" title="User:Loverbeauty" />