BRE call .net assembly

devMonkey

I am reading that I can pass a message to a .NET class method which
can handle a message modification as a rule. I see how to configure
this in the rule policy creator but am confused as to what the
signature of the method will look like that I pass my message to. I
know it would take the message by reference but what type does it need
to be so that the rule engine can handle creating a new message from
the result?

Xlang, XmlDocument, XmlTypedDocument?
Can someone please show me an example
Thanks