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 gafcontinue="Betsy-desk.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="545" ns="6" title="File:BHP452 OM.pdf" />
      <page pageid="494" ns="6" title="File:BJV180 manual.pdf" />
      <page pageid="13703" ns="6" title="File:Badge Maker Instructions.pdf" />
      <page pageid="13681" ns="6" title="File:Badge maker template.zip" />
      <page pageid="13730" ns="6" title="File:Badge maker tips.pdf" />
      <page pageid="825" ns="6" title="File:Bagofleds.jpg" />
      <page pageid="823" ns="6" title="File:Barometric.jpg" />
      <page pageid="836" ns="6" title="File:Bbbbb.jpg" />
      <page pageid="548" ns="6" title="File:Belt Disc Sander.jpg" />
      <page pageid="286" ns="6" title="File:Benjymous.jpg" />
    </pages>
  </query>
</api>