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To remove this redundancy we delete the textual essence description and add
the stereotype ?«essential?» to the actions in the activity ( Figure 2.56 ). 15 This has
the additional advantage that we see the essence in the activity directly. However,
this modeling technique makes sense only provided that your modeling tool
allows you to generate an essential description in the form of a text document
from the activities. Otherwise, you ??™ d lose the simple??”purely textual??”view of the
essence. Many SysML/UML tools have interfaces to support such individual extensions,
but they are not included in the standard product.
In the next step we look at the paths outside the standard fl ow. This means
that we now take off our rose-colored spectacles and analyze what should happen
if things are not ??? normal. ???
FIGURE 2-55
Arbitrary sequence?
act Start car usage [sequence?]
Unlock car
Check disposal right
Check disposal right
Unlock car
Start car
usage
Start car
usage
?
15As described further below and in Section 5.


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