Transfer is silent on some key interoperability issue w.r.t. transfer
data between the client and service:
- how does the client know the schema of the resource(s) behind an EPR
- how does the client know what instructions (QNames) are allowed in the create
- how does the client know the schema returned on the Get (if its different from the first bullet)

Since the Transfer wsdl/xsd only shows an xs:any, those metadata files
are not really very useful in determining this information.