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="Lin-Cyber_Conflict_and_National_Security_2012.pdf|56" />
      <page pageid="2" ns="0" title="Main Page" />
      <page pageid="11" ns="0" title="Cybersecurity Annotated Bibliography" />
      <page pageid="26" ns="0" title="Attribution" />
      <page pageid="27" ns="0" title="International Law (including Laws of War)" />
      <page pageid="28" ns="0" title="Cyberwar" />
      <page pageid="31" ns="0" title="Government Reports and Documents" />
      <page pageid="34" ns="0" title="Economics of Cybersecurity" />
      <page pageid="36" ns="0" title="Cybercrime" />