NEG — Page 90, 3rd pagragraph, 1st sentence

Page 90, 3rd pagragraph, 1st sentence reads: "It is important to note that
the bilateral negotiation state transition model is simply an example of a
collaborative process model." I doubt it is your intention, but this could
be interpreted as backing away from requiring, as a conformance point,
support of the bilateral model.
Page 90 and others: The state charts are somewhat non-standard. The box
with the triangular end for a state transition is not standard UML as far
as I know.