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="14097_КП" />
</query-continue>
<query>
<allcategories>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">1052 КП</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">1192 КП</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">12860 КП</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">12972 КП</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">12 посёлок КП</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">1310 КП</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">13804 КП</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">13999 КП</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">14-й поселок КП</c>
<c size="0" pages="0" files="0" subcats="0" xml:space="preserve">14-й посёлок КП</c>
</allcategories>
</query>
</api>