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="Benchmarking_Moss.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="743" ns="6" title="File:BRL-CAD GSoC2011 flyer.png" />
      <page pageid="1446" ns="6" title="File:BRL-CAD Primitives Chart.png" />
      <page pageid="1311" ns="6" title="File:BRL-CAD homepage.PNG" />
      <page pageid="679" ns="6" title="File:BRL CAD g format V5.pdf" />
      <page pageid="762" ns="6" title="File:Backstaff.jpg" />
      <page pageid="31" ns="6" title="File:Benchmark.pdf" />
      <page pageid="1437" ns="6" title="File:BenchmarkHome.png" />
      <page pageid="1362" ns="6" title="File:Benchmark overview v3.jpg" />
      <page pageid="12" ns="6" title="File:Benchmarking Bldg 391.jpg" />
      <page pageid="14" ns="6" title="File:Benchmarking M35.jpg" />
    </pages>
  </query>
</api>