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="1" ns="0" title="Main Page">
        <images>
          <im ns="6" title="File:002-dsc 0046.jpg" />
          <im ns="6" title="File:004-img027.jpg" />
          <im ns="6" title="File:005-path wp 3.png.jpeg" />
          <im ns="6" title="File:Cajunbot.jpg" />
          <im ns="6" title="File:Darpa gc04 main.jpg" />
          <im ns="6" title="File:Raginbot.jpg" />
          <im ns="6" title="File:Screen shot 2010-04-28 at 5.54.26 PM.png" />
          <im ns="6" title="File:Screen shot 2010-04-28 at 6.07.26 PM.png" />
          <im ns="6" title="File:What is cbsystem diagram.png" />
        </images>
      </page>
    </pages>
  </query>
</api>