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"?>
<api>
  <query-continue>
    <allfileusages gafcontinue="Book.png|122" />
  </query-continue>
  <query>
    <pages>
      <page pageid="43" ns="0" title="Rolepay Money System" />
      <page pageid="44" ns="0" title="Nexus Gridwide Radios" />
      <page pageid="68" ns="0" title="Nexus Freight Elevator" />
      <page pageid="75" ns="0" title="Nexus EX27 Taser" />
      <page pageid="83" ns="0" title="Nexus Pager System" />
      <page pageid="87" ns="0" title="Nexus Fire Alarms" />
      <page pageid="92" ns="0" title="Nexus Boom Box" />
      <page pageid="101" ns="0" title="Nexus Intercom System" />
      <page pageid="106" ns="0" title="Nexus Radio Scanner" />
      <page pageid="111" ns="0" title="Nexus Sound System" />
    </pages>
  </query>
</api>