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="Term|39" />
  </query-continue>
  <query>
    <pages>
      <page pageid="34" ns="0" title="Accreditation" />
      <page pageid="35" ns="0" title="Accreditation of Prior Learning (APL)" />
      <page pageid="36" ns="0" title="Action Review" />
      <page pageid="37" ns="0" title="Action Space" />
      <page pageid="38" ns="0" title="Active Report" />
      <page pageid="328" ns="0" title="Learning Objectives" />
      <page pageid="444" ns="0" title="How to do" />
      <page pageid="842" ns="0" title="Problem Tree Analysis" />
      <page pageid="1248" ns="0" title="Prova" />
      <page pageid="1254" ns="2" title="User:Giulia.ortoleva" />
    </pages>
  </query>
</api>