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="ЧаВо" />
</query-continue>
<query>
<allcategories>
<c size="4" pages="4" files="0" subcats="0" xml:space="preserve">XML экспорт:Сервисы</c>
<c size="8" pages="8" files="0" subcats="0" xml:space="preserve">Визуальные настройки</c>
<c size="19" pages="19" files="0" subcats="0" xml:space="preserve">Модули</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Общие настройки</c>
<c size="7" pages="7" files="0" subcats="0" xml:space="preserve">Описание работы модулей</c>
<c size="20" pages="20" files="0" subcats="0" xml:space="preserve">Полезная информация</c>
<c size="4" pages="4" files="0" subcats="0" xml:space="preserve">Полезный функционал</c>
<c size="12" pages="12" files="0" subcats="0" xml:space="preserve">Словарь терминов</c>
<c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Страницы с неработающими файловыми ссылками</c>
<c size="94" pages="94" files="0" subcats="0" xml:space="preserve">Функциональные настройки</c>
</allcategories>
</query>
</api>