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="Barbourville,_Ky.jpg" />
      <page pageid="2317" ns="6" title="File:BGTLogo-1-.jpg" />
      <page pageid="17425" ns="6" title="File:BIPPS Logo 150.jpg" />
      <page pageid="1133" ns="6" title="File:Ballad County Grad.JPG" />
      <page pageid="8922" ns="6" title="File:Ballard.jpg" />
      <page pageid="2192" ns="6" title="File:BallardCoMap.jpg" />
      <page pageid="1821" ns="6" title="File:Ballard co.JPG" />
      <page pageid="6919" ns="6" title="File:Bancroft city.jpg" />
      <page pageid="338" ns="6" title="File:BangForTheBuckcover.jpg" />
      <page pageid="24478" ns="6" title="File:Bang for the Buck 2012.png" />
      <page pageid="6921" ns="6" title="File:Barbourmeade city.jpg" />