
Chapter 8. Web service specifications 173
Example 8-5 A valid timestamp
<wsu:Timestamp wsu:Id="timestamp">
<wsu:Created>2001-09-13T08:42:00Z</wsu:Created>
<wsu:Expires>2001-10-13T09:00:00Z</wsu:Expires>
</wsu:Timestamp>
References
References are the mechanism we use to refer to another part of the SOAP
message. Sections of the message are identified by Id values so that we can
refer to them. Of course, if several sections of the message had the same Id
value, the reference would be ambiguous. Hence the profile specifies:
All Id values must be unique.
Processing order
Consider what happens when we both encrypt and digitally sign a message. The ...