BPMN2 — Section 8.3.15 [Choreo] ParticipantMultiplicity must allow to specify 1..2, possibly also 0..1

Description of issue: The attributes minimum and maximum are mandated to have a min value of 2. Why would multiplicities such as 1..2 be excluded? Couldn't there even be optional participants?

Proposal: At the very least, the minimum attribute should allowed to have a minimum of 1. Possibly, minimum should be allowed to start at 0, and maximum at 1.

Comments:
From: wstephe created: Fri, 11 Sep 2009 13:19:42 -0500 (CDT)
The section, table, and page numbers were updated to match the Beta 1 Spec.

8.3.15 Participants
p94
"When the minimum attribute of the ParticipantMultiplicty element has been set by the modeler, then the multiinstance
marker will be displayed in bottom center of the Pool (Participant - see Figure 8-41) or the Participant Band
of a Choreography Activity (see page 356)."
change to:
"The multi-instance marker will be displayed in bottom center of the Pool (Participant - see Figure 8-41), or the Participant Band of a Choreography Activity (see page
356), when the ParticipantMultiplicity is associated with the Participant, and the maximum attribute is either not set, or has a value of two (2) or more."
Table 8.56 ParticipantMultiplicity attributes
Change from "minimum: integer [0..1] = 2" to "minimum: integer = 0" - mandatory with default value of 0
with suitable update to schema.
"The minimum attribute defines minimum number of Participants that
MUST be involved in the Collaboration. The value of minimum MUST be
two (2) or greater."
change to:
"The minimum attribute defines minimum number of Participants that
MUST be involved in the Collaboration. If a value is specified in the
maximum attribute, it MUST be greater or equal to this minimum value."
Change from "maximum: integer [0..1] = 2" to "maximum: integer [0..1] = 1" - optional with default value of 1.
"The maximum attribute defines maximum number of Participants that
MAY be involved in the Collaboration. The value of maximum MUST be
two (2) or greater."
change to:
"The maximum attribute defines maximum number of Participants that
MAY be involved in the Collaboration. The value of maximum MUST be
one (1) or greater, AND must be equal or greater than the minimum value."
Disposition: Resolved