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Kohei raised the point that the current session mechanism is implicit and not explicit. Clarification is need to make it explicit.
Add as 2nd paragraph to "5.7 Choreography Life-line" : Distinct instances of a top-level or enclosed choreography, if they ever run in a temporarily overlapped fashion, must not interfere with each other in their involved communication actions. In other words, given a choreography description, interactions belonging to one of its instances must be logically, hence executionally, distinguishable from those in another.
editors have completed and reported at 19 jul 05 meeting: http://lists.w3.org/Archives/Member/member-ws-chor/2005Jul/att- 0009/minutes_20050719_-_0.txt
marked as closed
resolution is in the spec so close confirmed.