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="MMgesch2.jpg|961" />
  </query-continue>
  <query>
    <pages>
      <page pageid="936" ns="0" title="MovieMeter" />
      <page pageid="961" ns="0" title="Geschiedenis van MovieMeter" />
      <page pageid="985" ns="0" title="Filmpagina" />
      <page pageid="1043" ns="0" title="Gebruik van Photoshop" />
      <page pageid="1338" ns="4" title="MovieMeterWiki:Artikelen schrijven" />
      <page pageid="1401" ns="1" title="Overleg:Tijdlijn van MovieMeter" />
      <page pageid="1491" ns="7" title="Overleg bestand:Statusscherm.jpg" />
    </pages>
  </query>
</api>