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="1952_establishments_in_the_United_States" />
</query-continue>
<query>
<allcategories>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">1017 Brick Squad artists</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">1907 births</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">1930 introductions</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">1931 births</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">1938 births</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">1940 births</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">1941 births</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">1942 births</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">1950 births</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">1951 births</c>
</allcategories>
</query>
</api>