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 API help for more information.
<?xml version="1.0"?>
<api>
  <query-continue>
    <allcategories accontinue="1963_Births" />
  </query-continue>
  <query>
    <allcategories>
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve" />
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve">!Artigos mínimos</c>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">&quot;Policy Priorities&quot;</c>
      <c size="2" pages="2" files="0" subcats="0" xml:space="preserve">&quot;Titanic Book&quot; Collection</c>
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve">1940 Births</c>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">1951 Births</c>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">1956 births</c>
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve">1959 Births</c>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">1961 Births</c>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">1962 Births</c>
    </allcategories>
  </query>
</api>