You are looking at the HTML representation of the XML format.
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.
See the complete documentation, or
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<?xml version="1.0"?>
<api>
<query-continue>
<allcategories accontinue="03月08日出生" />
</query-continue>
<query>
<allcategories>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">.洪森澤</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">01月04日出生</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">01月05日出生</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">01月08日出生</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">01月13日出生</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">01月20日出生</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">02月01日出生</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">02月14日出生</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">02月28日出生</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">03月04日出生</c>
</allcategories>
</query>
</api>