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>
    <alltransclusions gatcontinue="Depreciated|1406" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1392" ns="0" title="1.12 Group Changes" />
      <page pageid="1397" ns="0" title="Senior Peacekeeper" />
      <page pageid="1398" ns="0" title="Peacekeeper" />
      <page pageid="1399" ns="0" title="Sandbox Management" />
      <page pageid="1400" ns="0" title="High Council of Wyrms" />
      <page pageid="1401" ns="0" title="Events Management" />
      <page pageid="1402" ns="0" title="Land Management" />
      <page pageid="1403" ns="0" title="Initiate Peacekeeper" />
      <page pageid="1404" ns="0" title="High Council Initiate" />
      <page pageid="1405" ns="0" title="Market Official" />
    </pages>
  </query>
</api>