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HTML is good for debugging, but is unsuitable for application use.
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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="Beryllium_Release" />
</query-continue>
<query>
<allcategories>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">%s</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">AD-SAL</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">ADSAL</c>
<c size="14" pages="14" files="0" subcats="0" xml:space="preserve">AGING</c>
<c size="9" pages="9" files="0" subcats="0" xml:space="preserve">App Projects</c>
<c size="8" pages="8" files="0" subcats="0" xml:space="preserve">Application Projects</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Apps Projects</c>
<c size="10" pages="10" files="0" subcats="0" xml:space="preserve">Archived Projects</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Articles which use embedded infobox templates with the title parameter</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Articles which use infobox templates with no data rows</c>
</allcategories>
</query>
</api>