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>
    <allimages gaicontinue="Electronic_cigarette_3901.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="59" ns="6" title="File:Cam logo.gif" />
      <page pageid="57" ns="6" title="File:Complexmodelling rmc.jpg" />
      <page pageid="71" ns="6" title="File:Download help.jpg" />
      <page pageid="68" ns="6" title="File:Download instructions.pdf" />
      <page pageid="40" ns="6" title="File:Electronic cigarette 1432.jpg" />
      <page pageid="44" ns="6" title="File:Electronic cigarette 2130.jpg" />
      <page pageid="36" ns="6" title="File:Electronic cigarette 2224.jpg" />
      <page pageid="42" ns="6" title="File:Electronic cigarette 2599.jpg" />
      <page pageid="32" ns="6" title="File:Electronic cigarette 3745.jpg" />
      <page pageid="30" ns="6" title="File:Electronic cigarette 3837.jpg" />
    </pages>
  </query>
</api>