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>
    <allimages gaicontinue="2014_portfolio_73.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="455" ns="6" title="File:1043 Rekenvoorbeeld.pdf">
        <duplicatefiles>
          <df name="Rekenvoorbeeld_BK1.pdf" user="Ahsnijder" timestamp="2013-11-21T13:04:47Z" />
        </duplicatefiles>
      </page>
      <page pageid="1364" ns="6" title="File:178.png" />
      <page pageid="1579" ns="6" title="File:198.png" />
      <page pageid="1580" ns="6" title="File:200.jpg" />
      <page pageid="456" ns="6" title="File:2000 Rekenvoorbeeld.pdf">
        <duplicatefiles>
          <df name="Rekenvoorbeeld_BK2.pdf" user="Ahsnijder" timestamp="2013-11-21T13:05:10Z" />
        </duplicatefiles>
      </page>
      <page pageid="749" ns="6" title="File:2011 portfolio materials baksteen.jpg">
        <duplicatefiles>
          <df name="Monsterkast_1.jpg" user="Frschnater" timestamp="2014-05-15T21:19:57Z" />
        </duplicatefiles>
      </page>
      <page pageid="966" ns="6" title="File:2014 portfolio 123.jpeg">
        <duplicatefiles>
          <df name="Monsterkast_123.jpeg" user="Frschnater" timestamp="2014-05-16T06:05:22Z" />
        </duplicatefiles>
      </page>
      <page pageid="969" ns="6" title="File:2014 portfolio 140.jpg">
        <duplicatefiles>
          <df name="Monsterkast_140.jpg" user="Frschnater" timestamp="2014-05-16T06:06:59Z" />
        </duplicatefiles>
      </page>
      <page pageid="967" ns="6" title="File:2014 portfolio 43.jpg">
        <duplicatefiles>
          <df name="Monsterkast_43.jpg" user="Frschnater" timestamp="2014-05-16T05:59:05Z" />
        </duplicatefiles>
      </page>
      <page pageid="968" ns="6" title="File:2014 portfolio 69.jpg">
        <duplicatefiles>
          <df name="Monsterkast_69.jpg" user="Frschnater" timestamp="2014-05-16T06:01:23Z" />
        </duplicatefiles>
      </page>
    </pages>
  </query>
</api>