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"?>
      <page pageid="274" ns="6" title="File:Case studies.svg" />
      <page pageid="275" ns="6" title="File:H2o icon.svg" />
      <page pageid="279" ns="6" title="File:Help icon4.svg" />
      <page pageid="299" ns="6" title="File:Lin-Cyber Conflict and National Security 2012.pdf" />
      <page pageid="300" ns="6" title="File:NRC-Cyberattack Capabilities-2009.pdf" />
      <page pageid="270" ns="6" title="File:Toc icon.svg" />