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All model
elements contained can be identifi ed by unique names. This means that no two elements
of the same name can be in one package. The fully qualifi ed name of an element
refl ects the nesting of namespaces with the double colon, for example, Use
Cases::Car usage::Start car usage in Figure 3.82 .
SysML demands that elements in diagrams that origin from another namespace
than that represented by the diagram be specifi ed with their fully qualifi ed names.
The notation is based on the usual symbols for directories. The name of the
package is in the center or on the folder tab, if the content of the package is represented.
The contents can also be shown in tree structure using the include 20
relationship ( Figure 3.82 ).
3.10 Other Model Elements
This section discusses UML model elements that do not fit in one of the previous
categories such as the class diagram. They offer cross-section functions that can be
used in a wide range of different areas. These elements include, for example, the
information flow that shows the data flow in various diagrams.


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