Connecting Objects
The lines that connect elements: sequence flow (internal ordering), message flow (communication between Pools) and association (artifacts).
- Sequence Flow
The solid arrow that defines execution order between elements of the same process — the path the token walks from start to end.
- Message Flow
The dashed connector that carries a message between two different participants (Pools). Open circle at the origin, open arrowhead at the target.
- Association
The dotted line that attaches artifacts — text annotations, data objects — to flow elements. Purely documentary; the token never travels it.