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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>
<allcategories>
<c size="5" pages="5" files="0" subcats="0" xml:space="preserve">Launch vehicles</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Lunar lander</c>
<c size="2" pages="2" files="0" subcats="0" xml:space="preserve">Lunar outpost designs</c>
<c size="9" pages="9" files="0" subcats="0" xml:space="preserve">Mission Plans</c>
<c size="23" pages="23" files="0" subcats="0" xml:space="preserve">Modular pieces of equipment</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Pages with broken file links</c>
<c size="12" pages="12" files="0" subcats="0" xml:space="preserve">Surface suits</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Technolgies</c>
</allcategories>
</query>
</api>