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5 ,
230 CHAPTER 4 SysML??”The Systems Modeling Language
for example: The response time of the reservation system is derived from the
business requirement usage comfort .
There are cases when we don ??™ t want to represent all elements participating
in a derive requirement relationship in the diagram. Figure 4.6 shows the derive
requirement relationship from Figure 4.5 in the form of comment symbols??”the
so-called callout notation . This example shows all elements in the diagram for
better understanding.
The term derive is often used for the generalization relationship as well. You
should be careful in discussions and during your modeling work not to confuse
the term to avoid misunderstandings.
4.3.3 Namespace Containment
FIGURE 4-6
Alternative notation for the derive requirement relationship.
1 You can think of namespaces in SysML as directories on your hard disk. The elements in a namespace
correspond to files.
Defi nition
A namespace containment describes that a requirement is contained in
another requirement.
Requirements are on different hierarchical levels.


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