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>
    <allfileusages gafcontinue="Babylooneys.png|2298" />
  </query-continue>
  <query>
    <pages>
      <page pageid="561" ns="0" title="Universi paralleli per Bucky O&#039;Hare" />
      <page pageid="1376" ns="0" title="Primates" />
      <page pageid="1621" ns="0" title="Best Thing In Town" />
      <page pageid="2115" ns="0" title="Babar (letteratura)" />
      <page pageid="2117" ns="0" title="Re Babar" />
      <page pageid="2474" ns="0" title="Burned Furs" />
      <page pageid="2737" ns="0" title="Bear nella grande casa blu" />
      <page pageid="2840" ns="0" title="Babs Bunny" />
      <page pageid="4074" ns="0" title="Babe - Maialino coraggioso" />
      <page pageid="4076" ns="0" title="Babe va in città" />
    </pages>
  </query>
</api>