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="CEED|1882" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page" />
      <page pageid="965" ns="0" title="CELayout Editor - Getting Started / Building" />
      <page pageid="1443" ns="0" title="Overview of GUI files" />
      <page pageid="1449" ns="0" title="Obtaining the library source from Subversion" />
      <page pageid="1461" ns="0" title="Assembling a Toolset" />
      <page pageid="1723" ns="0" title="CEGUI Downloads 0.7.1" />
      <page pageid="1763" ns="0" title="Performance tips" />
      <page pageid="1779" ns="0" title="Build from Source for Win32" />
      <page pageid="1781" ns="0" title="Build Configuration For Irrlicht" />
      <page pageid="1895" ns="0" title="Building from source" />
    </pages>
  </query>
</api>