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Tim Weilkiens

"Systems Engineering with SysML/UML: Modeling, Analysis, Design"

???
sd System start
:System :SubSystem1
start()
par
:SubSystem2
initialize()
initialize()
210 CHAPTER 3 UML??”Unifi ed Modeling Language
car management system in Figure 3.77 queries the status of all on-board computers
( numberBC ) in a loop. 18
3.8.5 Interaction Use
18 This is a simplified representation; it does not show how each of the on-board computers is
determined.
FIGURE 3.77
Example for the interaction operator ???loop.???
sd System status
:Car management
system
queryStatus()
bc[i]:On-board
computer
loop(0,numberBC)
Defi nitions
An interaction use is a reference to an interaction. The model is designed
such that the reference could be substituted by the referenced interaction.
A part decomposition describes the internal interactions of a lifeline.
An interaction use is used to describe parts of interactions from one sequence
diagram in a separate sequence diagram. This means that large interaction can be
decomposed into manageable units.
Decomposing sequence diagrams into manageable sizes is only one benefi t
of an interaction use.


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