7.5.13 Usage of MessageParts
When you use the <Integrity> assertion in your WS-Policy file, you are required to also use the Target child assertion to specify the targets of the SOAP message to digitally sign. The <Target> assertion in turn requires that you use the <MessageParts> child assertion to specify the actual parts of the SOAP message that should be digitally signed. You can use the Dialect attribute of <MessageParts> to specify the dialect used to identify the SOAP message parts. SALT Web services security module supports only the following dialect:
Be sure that you specify a message part that actually exists in the SOAP messages that result from a client invoke of a message-secured Web Service. If the Web Services security module encounters an inbound SOAP message that does not include a part that the WS-Policy file indicates should be signed or encrypted, then the Web Services security module returns an error and the invoke fails.