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="Brain-map-of-clifton-b.jpg|429" />
      <page pageid="199" ns="0" title="Test" />
      <page pageid="245" ns="0" title="Typefaces for Book Writing" />
      <page pageid="386" ns="0" title="Activity Theory" />
      <page pageid="413" ns="0" title="Bee Dance" />
      <page pageid="429" ns="0" title="Brain Map" />
      <page pageid="1027" ns="0" title="Banff New Media Institute" />
      <page pageid="1223" ns="0" title="Body Optimization" />
      <page pageid="1293" ns="0" title="Bill Verplank" />
      <page pageid="1381" ns="0" title="Bill Hillier" />
      <page pageid="1406" ns="0" title="Main Page Sandbox" />