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>
    <alllinks galcontinue="Cross_domain_guard" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="CIL Language" missing="" />
      <page pageid="91" ns="0" title="BasicConcepts" />
      <page pageid="181" ns="0" title="Bounds Rules" />
      <page pageid="123" ns="0" title="Building a Basic Policy" />
      <page pageid="124" ns="0" title="Building the XSELinux Function Test Application" />
      <page pageid="150" ns="0" title="COTS" />
      <page pageid="106" ns="0" title="ConditionalStatements" />
      <page pageid="83" ns="0" title="Conferences" />
      <page pageid="114" ns="0" title="ConfigurationFiles" />
      <page pageid="107" ns="0" title="ConstraintStatements" />
    </pages>
  </query>
</api>