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="Bong.jpeg|68" />
  </query-continue>
  <query>
    <pages>
      <page pageid="132" ns="0" title="Bogart" />
      <page pageid="538" ns="0" title="Bob Marley" />
      <page pageid="849" ns="0" title="Charas" />
      <page pageid="878" ns="0" title="Oaksterdam University" />
      <page pageid="901" ns="0" title="Bill Clinton" />
      <page pageid="941" ns="0" title="Loretta Nall" />
      <page pageid="1338" ns="0" title="BC Bud" />
      <page pageid="1369" ns="0" title="Blue Dream (cannabis)" />
      <page pageid="1531" ns="0" title="Office of National Drug Control Policy" />
    </pages>
  </query>
</api>