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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.
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<?xml version="1.0"?>
<api>
<query-continue>
<allcategories accontinue="Child_of_Gaia" />
</query-continue>
<query>
<allcategories>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">?</c>
<c size="69" pages="69" files="0" subcats="0" xml:space="preserve">Ahroun</c>
<c size="7" pages="7" files="0" subcats="0" xml:space="preserve">Black Furies</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Black Fury</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Black Spiral Dancer</c>
<c size="4" pages="4" files="0" subcats="0" xml:space="preserve">Black Spiral Dancers</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Bone Gnawer</c>
<c size="21" pages="21" files="0" subcats="0" xml:space="preserve">Bone Gnawers</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Bonegnawer</c>
<c size="7" pages="7" files="0" subcats="0" xml:space="preserve">Bonegnawers</c>
</allcategories>
</query>
</api>