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HTML is good for debugging, but is unsuitable for application use.
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To see the non HTML representation of the XML format, set format=xml.
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<?xml version="1.0"?>
<api>
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    <allimages gaicontinue="Bsd-3-clause-0627.html" />
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  <query>
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      <page pageid="236" ns="6" title="File:Apache-1.1.html" />
      <page pageid="220" ns="6" title="File:Appusecase.jpg" />
      <page pageid="48" ns="6" title="File:Beta-tools-overview-v2-0.pptx">
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        </duplicatefiles>
      </page>
      <page pageid="46" ns="6" title="File:Beta-tools-overview-v2.pptx">
        <duplicatefiles>
          <df name="Beta-tools-overview-v2-0.pptx" user="Kweins" timestamp="2011-01-20T16:55:26Z" />
        </duplicatefiles>
      </page>
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  </query>
</api>