WSDL2Java doesn't generate code for a porttype not referenced by a service

The PortType already contains the information to generate the interface and related code. We don't necessarily need a service element to contain the binding to refer to the port type, because we can just use the WSDL as the interface but do not use the WSDL as the binding for the SCA service. For example, we can use the WSDL as the interface and use EJB binding. Therefore, the lack of a service element in the WSDL should not prevent code generation.