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="Blender_wing_images-000.ppm.png" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2365" ns="6" title="File:BL2D.tar" />
      <page pageid="3416" ns="6" title="File:Bbopt.png" />
      <page pageid="1675" ns="6" title="File:BcOscilating.tar.gz" />
      <page pageid="3695" ns="6" title="File:Before getting started - example 00.png" />
      <page pageid="3694" ns="6" title="File:Before getting started - example 01.png" />
      <page pageid="3696" ns="6" title="File:Before getting started - example 02.png" />
      <page pageid="4558" ns="6" title="File:BernhardGschaider-OFW15 ProgrammingPyFoamTraining.pdf" />
      <page pageid="4557" ns="6" title="File:BernhardGschaider-OFW15 swakPyFoamBasicTraining.pdf" />
      <page pageid="4671" ns="6" title="File:BernhardGschaider-OFW17 swakPyFoamBasicTraining.pdf" />
      <page pageid="1581" ns="6" title="File:Blender Wing Tutorial.zip" />
    </pages>
  </query>
</api>