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="DCvsTC_Benchmark_Core_i7_940.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="148" ns="6" title="File:Bulbgraph.png" />
      <page pageid="1468" ns="6" title="File:DC scr CD encr.png" />
      <page pageid="1467" ns="6" title="File:DC scr about.png" />
      <page pageid="1528" ns="6" title="File:DC scr bootconfig.png" />
      <page pageid="1469" ns="6" title="File:DC scr encr.png" />
      <page pageid="1471" ns="6" title="File:DC scr main.png" />
      <page pageid="1470" ns="6" title="File:DC scr settings.gif" />
      <page pageid="1539" ns="6" title="File:DCvsTC Benchmark 2x Intel Xeon E5540.png" />
      <page pageid="1540" ns="6" title="File:DCvsTC Benchmark Core i5 660.png" />
      <page pageid="1542" ns="6" title="File:DCvsTC Benchmark Core i7 2600K.png" />
    </pages>
  </query>
</api>