Amazon Marketplace API - wsdl

I have been around the web a lot in the past day and was wondering does Amazon API have a .wsdl file? Im struggling to understand how I talk to their web service.

I've downloaded http://ift.tt/1G1EnoU

And have also signed up for MWS. As well as found this wsdl file but this seems to relate to something else as I cant find reference to anything I found related to MWS such as OperationType. http://ift.tt/1M0Fc1y

However at no point does it seem to reference a wsdl file.

Am I missing something?