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They do not contain
any information as to whether the serves they describe are implemented
in software or hardware, or by an individual. The applications for use cases are
accordingly numerous, including systems engineering.
The use case model is integrated in SysML in unchanged and complete form
from UML ( Figure 4.47 ).
FIGURE 4-45
Example for a constraint library.
FIGURE 4-46
Using constraint blocks.
par [block] Newton??™s world
?«constraint?»
mb:Mass relationship
Apple.volume
v:
Apple.density
d:
m:
m:
gN:Newton??™s law
Planet.gravitation
a:
pE:Potential energy
f :
f :
Apple
Tree.height
h:
Human.impact
E:
bdd [package] Constraint library [Newton??™s world]
parameters
constraints
?«constraint?»
m: Mass
v : Volume
d : Density
parameters
constraints
?«constraint?»
f : Force
m: Mass
a : Acceleration
parameters
constraints
?«constraint?»
f : Force
h: Height
Mass relationship Newton??™s law Potential energy
{mv *d} {fm*a} {Ef *h}
257
4.8 The Activity Diagram
The activity model specifies flows as well as input and output data, which are
required or created during a flow.


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