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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.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allfileusages afcontinue="CNH_Lakes_Year_2_Report.pdf" />
  </query-continue>
  <query>
    <allfileusages>
      <f ns="6" title="File:CNH-L Mendeley Instructions2.pdf" />
      <f ns="6" title="File:CNHAuthorshipGuidelines1Sep2017.pdf" />
      <f ns="6" title="File:CNHAuthorshipGuidelines 20Nov2019.docx" />
      <f ns="6" title="File:CNHAuthorshipGuidelines 20Nov2019.pdf" />
      <f ns="6" title="File:CNHGraphic.jpg" />
      <f ns="6" title="File:CNHLakesAuthorshipGuidelines v4.0 17Jan16.pdf" />
      <f ns="6" title="File:CNHTeamTeleconApr1.docx" />
      <f ns="6" title="File:CNHYear2Agenda.pdf" />
      <f ns="6" title="File:CNH Authorship Memo ManagementAndTeamScience 15Oct18.docx" />
      <f ns="6" title="File:CNH Lakes Year 1 Report.docx" />
    </allfileusages>
  </query>
</api>