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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>
<allcategories>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Column templates</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Documentation subpages</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Formatting templates</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Image insertion templates</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Multi-column templates</c>
<c size="4" pages="4" files="0" subcats="0" xml:space="preserve">Pages with broken file links</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Related-topic templates</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">See also templates</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Single-image insertion templates</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Table and column templates</c>
</allcategories>
</query>
<query-continue>
<allcategories accontinue="Talk_header_templates" />
</query-continue>
</api>