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="Badgev0.6_front.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2131" ns="6" title="File:BOM Montage.xls" />
      <page pageid="2112" ns="6" title="File:BOM Station CMS.xls" />
      <page pageid="235" ns="6" title="File:BOST ciseaux-coupe-tout.jpg" />
      <page pageid="807" ns="6" title="File:Badgev0.4 bot solder.png" />
      <page pageid="808" ns="6" title="File:Badgev0.4 bot solderwires.png" />
      <page pageid="809" ns="6" title="File:Badgev0.4 full.png" />
      <page pageid="810" ns="6" title="File:Badgev0.4 top components.png" />
      <page pageid="811" ns="6" title="File:Badgev0.4 top wires.png" />
      <page pageid="819" ns="6" title="File:Badgev0.6 all.png" />
      <page pageid="820" ns="6" title="File:Badgev0.6 back.jpg" />
    </pages>
  </query>
</api>