Defi nition
An essential activity describes the degree of details of an essential use case
step.
It is a stereotype ?«essential?» of the UML element activity.
To ensure that essential steps are directly visible in the diagram and that they can
be recognized by document generators, for example, the corresponding activities
are defi ned with the ?«essential?» stereotype ( Figure 5.7 ). The stereotype is also visible
in actions that invoke such an activity ( CallBehaviorAction ).
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You can fi nd an example for essential steps in the fl ow model in Figure 2.59 in
Section 2.4.5.
5.5 Domain Block
bdd [package] SYSMOD profile [requirement categories]
?«stereotype?»
Extended requirement
?«stereotype?»
Functional
requirement
?«stereotype?»
Constraint
requirement
?«stereotype?»
Usability
requirement
?«stereotype?»
Legal and business
rules requirement
?«stereotype?»
Reliability
?«stereotype?»
Supportability
?«stereotype?»
Performance
FIGURE 5-6
Requirement categories.
bdd [package] SYSMOD profile
[essential activity]
?«metaclass?»
UML4SysML::Activity
?«stereotype?»
Essential
FIGURE 5-7
The ?«essential?» stereotype for activities.
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