| Name | Target | Containment | Cardinality | Opposite | Description |
|---|---|---|---|---|---|
| fromKey | Factory | Yes | 0..1 | Transitions pass connection keys to pins at runtime so pins can properly wire transitions. | |
| fromPin | Pin | 1 | output | Transition has one source pin. | |
| toKey | Factory | Yes | 0..1 | ||
| toPin | Pin | 1 | input | Transition has one target pin. |