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>
    <pages>
      <page pageid="1383" ns="6" title="File:IMG 0068.jpg" />
      <page pageid="1381" ns="6" title="File:IMG 0224.jpg" />
      <page pageid="1382" ns="6" title="File:IMG 0253.jpg" />
      <page pageid="1380" ns="6" title="File:IMG 0259.jpg" />
      <page pageid="939" ns="6" title="File:RAW WAR.gif" />
      <page pageid="935" ns="6" title="File:Show image.jpg" />
    </pages>
  </query>
</api>