Issues with RPC/Encoded Messages
This topic is specific to a legacy technology. XML Web services and XML Web service clients should now be created using Windows Communication Foundation .
Some issues may arise with services that use RPC/Encoded messages.
The use of <simpleContent> extensions of <complexType> and <simpleType> restrictions are not supported.
Using encoding from SOAP 1.0 Section 5 is not compatible with WS-I Basic Profile 1.1.
Even when not BP-compliant, it is difficult to have any degree of interoperation with RPC/Encoded services.