R – How to access XML object in Restlet 2.0 thats wrapped inside a Representation object

Hi I am developing an application with Flex for the GUI and Restlet for the webservices. I have a strange problem. I put my XML as a property on a generic object, and send it as part of a POST request. But in the Restlet webservice, this XML is irretrievable. How do I retrieve it?
I tried initialising the received Representation object to a DomRepresentation, but thats not working. If I put the received Representation object into a Form object, then getFirstValue is returning that XML as a string!

I noticed that the contentType of the HTTPService was application/www-form-encoded so I set it to application/xml and its not helping either.

I use restlet 2.0m6 and here is the code snippet that I use –

@Post

public Representation process(Representation entity)

{

try

{

DomRepresentation dom = new DomRepresentation(entity);

Document d = dom.getDocument();

.

.

}
catch(Exception e)

{
e.printStackTrace();
}

and it throws a Null Pointer exception at the dom.getDocument() line. Which means no data actually arrived.

And my flex bit looks like this –
var service : HTTPService = new HTTPService();
service.method="POST";
service.contentType="application/xml"
service.url=url;
var token :AsyncToken = service.send(params);

where params is an XML object.