Hello,
we agreed in the TC, that my proposal (adding a rationale specifically to the case of flow vs. sequence) is too short sighted (because there might be some other places where a activity can be emulated by a more general one.
The idea was, to have a general rationale wording, with the case sequence vs. flow as just one simple sample. I think the following suggestion is not the final perfect wording, but the right place to clearify:
# 12 Structured Activities
# ...
# * Nondeterministic choice based on external events is provided by pick.
#
# > The set of activities in BPEL4WS is not intended to be the minimum required set.
# > There are cases where one activity can replace another type. For example
# > the sequence activity used to structure sequential processing may be emulated by a
# > more complex flow, which has links, to ensure sequential processing.
#
# Structured activities....
Greetings
Bernd
