Pim,
I not clear that what you are saying is more involved than what Jacques was originally proposing.
What I think I'm hearing as the simplest way forward is to support WS-RM as a delivery mechanism that would be transparent to the sender and receiver.
In other words - our ebMS headers are all that the participants need to complete - and then intermediaries may deliver on one or more hops via WS-RM - but that would be handled by those middle processes that would use the information in the ebMS packaging to enable WS-RM aware steps.
This means we just need to ensure ebMS packaging supports WS-RM - and keeps our specification clear and simple.
DW
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