Legacy Issue Number: 14815
Source: International Business Machines ( Suzette Samoojh)
The Sequence Flow constraints around the usage of Link Events are not clearly expressed in the spec.
Very simply, it should express that:
- A Catch Link Event should have no incoming Sequence Flow.
- A Throw Link Event should have no outgoing Sequence Flow.
Instead the spec has several rather confusing statements (pgs 235-236) that make it hard to infer the simple behavior I described above.
- If the Intermediate Event is used within normal flow:
- Intermediate Events MUST be the target of a Sequence Flow.
- An Intermediate Event MUST be a source for Sequence Flow.
- An exception to this: a source Link Intermediate Event (as defined below), it is not required to have an outgoing Sequence Flow.
- A Link Intermediate Event MUST NOT be both a target and a source of a Sequence Flow.
- A Link Intermediate Event MAY be the target (target Link) or a source (source Link) of a Sequence Flow, but MUST NOT be both a target and a source.
- Tighten up and simplify the constraint descriptions for Link Events.
- Refrain from introducing new terms "source" and "target", or if the new terms are needed, clearly relate them to the existing "catch" and "throw" terms.
Reported: BPMN 2.0b1 — Mon, 23 Nov 2009 05:00 GMT
Updated: Fri, 6 Mar 2015 20:57 GMT