Where can I get the official Corel SDK and documentation?

We would like to create a plugin for Corel Draw similar to our ExportKit Photoshop plugin - but  we are unable to find official documentation or the SDK download page, can someone help us with this please.

Thanks in advance.

P.S.
This will allow for Corel to export to HTML5, CSS, JavaScript, Flex, (.Net, C#, Java, SilverLight - with the Corel update) and more.  Accurate automation, check it out: http://www.exportkit.com, your's to discover!