You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information.
<?xml version="1.0"?>
<api>
  <query>
    <allcategories>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">English documentation</c>
      <c size="16" pages="0" files="16" subcats="0" xml:space="preserve">Fossils</c>
      <c size="5" pages="5" files="0" subcats="0" xml:space="preserve">Protected images</c>
      <c size="5" pages="5" files="0" subcats="0" xml:space="preserve">Protected templates</c>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Wiki.web.ru:Служебные шаблоны</c>
      <c size="2" pages="2" files="0" subcats="0" xml:space="preserve">Wiki.web.ru:Справка</c>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Wiki:Навигационные шаблоны</c>
      <c size="7" pages="7" files="0" subcats="0" xml:space="preserve">Wiki:Шаблоны:Внутренние ссылки</c>
      <c size="4" pages="4" files="0" subcats="0" xml:space="preserve">Wiki:Шаблоны для шаблонов</c>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">Акцессорные минералы</c>
    </allcategories>
  </query>
  <query-continue>
    <allcategories acfrom="Алеутская островная дуга" />
  </query-continue>
</api>