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>
<allcategories accontinue="Aardolie" />
</query-continue>
<query>
<allcategories>
<c size="9" pages="9" files="0" subcats="0" xml:space="preserve">14de eeuw</c>
<c size="2" pages="2" files="0" subcats="0" xml:space="preserve">17de eeuw</c>
<c size="3" pages="3" files="0" subcats="0" xml:space="preserve">18de eeuw</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">18de eeuws</c>
<c size="9" pages="9" files="0" subcats="0" xml:space="preserve">19de eeuw</c>
<c size="2" pages="2" files="0" subcats="0" xml:space="preserve">19de eeuws</c>
<c size="10" pages="10" files="0" subcats="0" xml:space="preserve">20ste eeuw</c>
<c size="9" pages="9" files="0" subcats="0" xml:space="preserve">20ste eeuws</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">A67</c>
<c size="4" pages="4" files="0" subcats="0" xml:space="preserve">Aa</c>
</allcategories>
</query>
</api>