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>
    <allfileusages afcontinue="Boat_mag_-_Eileen_Conn_interview.pdf" />
  </query-continue>
  <query>
    <allfileusages>
      <f ns="6" title="File:Balusters small1 redcd.jpg" />
      <f ns="6" title="File:Bellenden Rd-page-001.jpg" />
      <f ns="6" title="File:Bellenden Road traffic diversion.pdf" />
      <f ns="6" title="File:Benedict O&#039;Looney - CCQ.jpg" />
      <f ns="6" title="File:Billiard hall.jpg" />
      <f ns="6" title="File:Blackpool-Rd-A4-poster-v5.jpg" />
      <f ns="6" title="File:Blackpool Rd A4 poster v6A street names - coloured.jpg" />
      <f ns="6" title="File:Blackpool Road site allocation - original.pdf" />
      <f ns="6" title="File:Blenheim Grove comparison - flat.jpg" />
      <f ns="6" title="File:Board 4 PR station adapted v.07.jpg" />
    </allfileusages>
  </query>
</api>