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="Create-New-Account.pdf" />
  </query-continue>
  <query>
    <pages>
      <page pageid="96" ns="6" title="File:Basics of Shell Scripting.pdf" />
      <page pageid="314" ns="6" title="File:Benefit For School.pdf" />
      <page pageid="316" ns="6" title="File:CBSE Mapping for Classes.pdf" />
      <page pageid="307" ns="6" title="File:CI Flier.pdf" />
      <page pageid="173" ns="6" title="File:Camp Amb Brochure in.png" />
      <page pageid="171" ns="6" title="File:Camp Amb Brochure out.png" />
      <page pageid="93" ns="6" title="File:Camstudio-Bhojpuri.pdf" />
      <page pageid="94" ns="6" title="File:Camstudio-Malayalam.pdf" />
      <page pageid="95" ns="6" title="File:Camstudio-Telugu.pdf" />
      <page pageid="301" ns="6" title="File:Code-Files.pdf" />
    </pages>
  </query>
</api>