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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="Arbre" />
</query-continue>
<query>
<allcategories>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Ancien logement de fonction</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Ancien village</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Ancien établissement public</c>
<c size="17" pages="17" files="0" subcats="0" xml:space="preserve">Ancien établissement public colonial</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Ancienne Maison de commerce</c>
<c size="8" pages="8" files="0" subcats="0" xml:space="preserve">Ancienne capitale royale</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Ancienne maison commerce</c>
<c size="46" pages="46" files="0" subcats="0" xml:space="preserve">Ancienne maison de commerce</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Ancienne église</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Animal</c>
</allcategories>
</query>
</api>