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Subject: [ws-rx] POSSIBLE NEW ISSUE: WS-RX policies not manifested on the wire
Issue 9 asks whether WS-RX should define policy assertions to define various kinds of QoS properties for a message sequence. This certainly seems like a good subject for discussion and I don't mean to prejudge how the WG will decide this. What worries is something related. There is a tacit assumption that WS-RX policies will follow WS-Policy (latest public version Sept. 2004). This specification does not state explicitly how to tell whether a message conforms to a particular policy. The assumption is that one can examine the headers in the message and tell what policy is being followed. Thus, the effect of policies is manifested on the wire. But neither the suggested QoS assertions nor the existing WS-RX assertion declares the retry-interval etc. will appear as message headers. So, how do we tell what policy is being followed? Clearly, some other mechanism is needed. One way is for messages to carry the URI of the policy they adhere to. Another is to define headers in the start-sequence and sequence-started messages that indicate policy information. I'm sure folks can come up with other good suggestions. All the best, Ashok
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