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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>
    <allfileusages gafcontinue="ConceptualModelSummary.pdf" />
  </query-continue>
  <query>
    <pages>
      <page ns="6" title="File:BioNLP09.pdf" missing="" />
      <page pageid="26" ns="6" title="File:BURGERZZ.jpg" />
      <page pageid="389" ns="6" title="File:Bajzek-BashCycle.png" />
      <page pageid="36" ns="6" title="File:Bajzek-Daemon2.jpg" />
      <page pageid="59" ns="6" title="File:Beine-gpu.png" />
      <page pageid="71" ns="6" title="File:Brylow.png" />
      <page pageid="30" ns="6" title="File:CCICCADA Reconnect 2012.jpg" />
      <page pageid="649" ns="6" title="File:Circuitplayground.jpg" />
      <page pageid="659" ns="6" title="File:Competition and (1,2)-step Competition Numbers in 4-Cycle Graph Variations Paper.pdf" />
      <page pageid="612" ns="6" title="File:Compilation diagram pi3(2).png" />
    </pages>
  </query>
</api>