Choreography Sequence Flows

Sequence Flows are used within Choreographies to show the sequence of the Choreography Activities, which can have intervening Gateways. They are used in a similar way as they are in Processes -- only allowed to connect with other Flow Objects. within Processes, they can only connect Events, Gateways, and Activities. Within Choreographies, they can only connect Events, Gateways, and Choreography Activities.

There are two variations of Choreography Sequence Flows:

Default Sequence Flows: For Exclusive Gateways, Inclusive Gateways, and Choreography Activities that have Conditional Sequence Flows, one of the outgoing Sequence Flows MAY be a Default Sequence Flow. Because the other outgoing Sequence Flows will have appropriately visible data, Participants would know if all the other conditions would be false, thus the Default Sequence Flow would be selected and the Choreography would move down that Sequence Flow.
Conditional Sequence Flows; where conditions can be added to in two situations:
- From Gateways: Outgoing Sequence Flows have conditions for Exclusive and Inclusive Gateways. Data referenced in the conditions need to be visible to two or more Participants in the Choreography. Data becomes visible if it is part of a Message that had been sent (previously) within the Choreography.
- From Choreography Activities: Outgoing Sequence Flows MAY have conditions for Choreography Activities. Since these flows act similar to Inclusive Gateways, the Conditional Sequence Flows can be used in Choreographies. The conditions have the same restrictions that apply to the visibility of the data for Gateways.