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25

concurrent lifelines

-

for conditionals

-

for concurrency

linking sequence diagrams

ob1:C1

ob3:C3

ob2:C2

ob3:C3

op1

[x>0] foo(x)

[x<0] bar(x)

do(w)

do(z)

recurse()

[z=0] jar(z)

ob3:C3

[z=0] jar(z)

ob3:C3

conditional

recursion

Sequence Diagrams – Generic vs. Instance

2 forms of sd:

Instance sd: describes a specific scenario in detail; no conditions, branches or loops.

Generic sd: a use case description with alternative courses.

Here, conditional or concurrency?

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