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="14" pages="14" files="0" subcats="0" xml:space="preserve">お土産・名物</c>
      <c size="15" pages="14" files="0" subcats="1" xml:space="preserve">その他</c>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">その他学校</c>
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve">てつどう</c>
      <c size="89" pages="89" files="0" subcats="0" xml:space="preserve">みやこわが町宮古弁</c>
      <c size="89" pages="89" files="0" subcats="0" xml:space="preserve">わがまち石碑巡禮</c>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">スポーツ・芸能</c>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">モニュメント</c>
      <c size="4" pages="4" files="0" subcats="0" xml:space="preserve">リダイレクト</c>
      <c size="9" pages="9" files="0" subcats="0" xml:space="preserve">中世・豪族</c>
    </allcategories>
  </query>
  <query-continue>
    <allcategories acfrom="中学校" />
  </query-continue>
</api>