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="Cleanup|469" />
  </query-continue>
  <query>
    <pages>
      <page pageid="125" ns="0" title="Instant Gratification" />
      <page pageid="155" ns="0" title="Cyborg Swarms and Wearable Communities" />
      <page pageid="202" ns="0" title="Persistent Paleontology" />
      <page pageid="324" ns="0" title="The Cyborg&#039;s Dilemma - Progressive Embodiment in Virtual Environments" />
      <page pageid="370" ns="0" title="Paracosmic Immersion" />
      <page pageid="386" ns="0" title="Activity Theory" />
      <page pageid="457" ns="0" title="Domotics" />
      <page pageid="480" ns="0" title="Marshall McLuhan" />
      <page pageid="900" ns="0" title="Infosynaesthesia" />
      <page pageid="1659" ns="0" title="Locative Media" />
    </pages>
  </query>
</api>