MBSE with GENESYS Oct 2023

Key Semantics of Sequence Diagrams

• Blocks and lifelines • Interacting blocks (components) reflected at the top of the diagram • Lifeline shown as dashed line extending below block • Events • Execution instances of functions involved in the interaction • Represented as nodes on the lifeline

to which the function is allocated • Often unlabeled (emphasis on interaction between blocks)

393

Key Semantics of Sequence Diagrams, cont.

• Interaction operators • Lightweight (and incomplete) representation of structure enclosing functions and nested operators • Par – parallel • Alt – exclusive OR • Loop • Messages • Items sent and received between interacting entities • Represented as lines with arrowhead for direction of flow

Additional information available in Chapter 10 of A Practical Guide to SysML

394

MBSE with GENESYS