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="BAC_Program_Cover_1977.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="7346" ns="6" title="File:BAC 2002-2003.png" />
      <page pageid="636" ns="6" title="File:BAC Big Top (2007).jpg" />
      <page pageid="1879" ns="6" title="File:BAC Clowns 1987.jpg" />
      <page pageid="1585" ns="6" title="File:BAC Founders 1997.JPG" />
      <page pageid="287" ns="6" title="File:BAC Fron 1987.jpg" />
      <page pageid="286" ns="6" title="File:BAC Inside 1990.jpg" />
      <page pageid="231" ns="6" title="File:BAC Lincoln Center c1992.jpg" />
      <page pageid="7458" ns="6" title="File:BAC Lubin Poster.jpg" />
      <page pageid="3860" ns="6" title="File:BAC Poster (2014).jpeg" />
      <page pageid="5184" ns="6" title="File:BAC Poster 2011.jpeg" />
    </pages>
  </query>
</api>