如何将XML作为POST传递给asp.net中的ActionResult

I am trying to provide a simple RESTful API to my ASP MVC project. I will not have control of the clients of this API, they will be passing an XML via a POST method that will contain the information needed to perform some actions on the server side and provide back an XML with the result of the action. I don't have problems sending back XMLs, the problem is receiving XML via a POST. I have seen some JSON examples, but since I will not control my clients (it could be even a telnet from my point of view) I don't think JSON will work. Am I correct? I am trying to provide a simple RESTful API to