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"?>
    <allfileusages gafcontinue="Banjo_Billy_Jingle_Jangle_Comics.png" />
      <page pageid="4401" ns="6" title="File:BabyBrainsCD.jpg" />
      <page pageid="7970" ns="6" title="File:Backseat Boys Deadpool.jpg" />
      <page pageid="8561" ns="6" title="File:Bad Moves Craig of the Creek.png" />
      <page pageid="2939" ns="6" title="File:Bagpiper Lego picA0681ECE38DF543BD5E64A548A409CF2.jpg" />
      <page pageid="4734" ns="6" title="File:Bahama Knights Portlandia.png" />
      <page pageid="7221" ns="6" title="File:Bailey Sue T-Man.png" />
      <page pageid="6530" ns="6" title="File:Baker Nick Boy Loves Girl.png" />
      <page pageid="108" ns="6" title="File:Ballocaust.png" />
      <page pageid="4692" ns="6" title="File:Band-square3.JPG" />
      <page pageid="6925" ns="6" title="File:Bane Rena Love Diary.png" />