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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.
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<?xml version="1.0"?>
<api>
  <query-continue>
    <allcategories accontinue="Compositions_in_F_major" />
  </query-continue>
  <query>
    <allcategories>
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve">1808 compositions</c>
      <c size="2" pages="1" files="0" subcats="1" xml:space="preserve">250</c>
      <c size="7" pages="7" files="0" subcats="0" xml:space="preserve">250a</c>
      <c size="2" pages="2" files="0" subcats="0" xml:space="preserve">7745</c>
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve">CCRMA Studio D and E User Guide</c>
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve">CCRMA Studio Guides</c>
      <c size="42" pages="40" files="2" subcats="0" xml:space="preserve">CCRMA User Guide</c>
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve">CCRMA User Guides</c>
      <c size="0" pages="0" files="0" subcats="0" xml:space="preserve">Ccrma@satellite</c>
      <c size="1" pages="1" files="0" subcats="0" xml:space="preserve">ChucK</c>
    </allcategories>
  </query>
</api>