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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="Chrono_Crystal_Guide" />
</query-continue>
<query>
<allcategories>
<c size="1" pages="0" files="1" subcats="0" xml:space="preserve">8 Ball Pool Tips</c>
<c size="1" pages="0" files="1" subcats="0" xml:space="preserve">Age of Apes</c>
<c size="1" pages="0" files="1" subcats="0" xml:space="preserve">Avakin Life Guides</c>
<c size="1" pages="0" files="1" subcats="0" xml:space="preserve">Battle Zeni Strategies</c>
<c size="1" pages="0" files="1" subcats="0" xml:space="preserve">Bingo Blitz Guides</c>
<c size="1" pages="0" files="1" subcats="0" xml:space="preserve">Bleach Brave Souls</c>
<c size="1" pages="0" files="1" subcats="0" xml:space="preserve">CSR Racing 2 Tips</c>
<c size="1" pages="0" files="1" subcats="0" xml:space="preserve">Candle Farming</c>
<c size="1" pages="0" files="1" subcats="0" xml:space="preserve">Cash</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Category</c>
</allcategories>
</query>
</api>