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="Box-multilaser-isdb.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="4755" ns="6" title="File:B140 demodchip.jpg" />
      <page pageid="4753" ns="6" title="File:B140 tunerboard.jpg" />
      <page pageid="4754" ns="6" title="File:B140 tunerchip.jpg" />
      <page pageid="4752" ns="6" title="File:B140 usbboard.jpg" />
      <page pageid="4673" ns="6" title="File:BGT3540.png" />
      <page pageid="4613" ns="6" title="File:BILD0046.JPG" />
      <page pageid="981" ns="6" title="File:Bandwidth.jpg" />
      <page pageid="1953" ns="6" title="File:Bcompat.jpg" />
      <page pageid="4320" ns="6" title="File:Box-aoc-conectv-isdb.jpg" />
      <page pageid="4301" ns="6" title="File:Box-leadership-isdb.jpg" />
    </pages>
  </query>
</api>