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="440" ns="0" title="Main Page">
        <images>
          <im ns="6" title="File:45 web.jpg" />
          <im ns="6" title="File:901.182B 45 1000 s.png" />
          <im ns="6" title="File:901.227C 45 1000 s.png" />
          <im ns="6" title="File:901.244B005 45 1000 s.png" />
          <im ns="6" title="File:901.327E001 45 1000 s.png" />
          <im ns="6" title="File:901.327E001 bot 1000 s.png" />
          <im ns="6" title="File:901.549A002 45 1000 s.png" />
          <im ns="6" title="File:902.081 45 open 1000 s.png" />
          <im ns="6" title="File:CP2104 45.jpg" />
          <im ns="6" title="File:DW1000 Sick LP 45 1000.jpg" />
        </images>
      </page>
    </pages>
  </query>
  <query-continue>
    <images imcontinue="440|DW1000_Stick_45-2_1000.jpg" />
  </query-continue>
</api>