Packages and Namespaces - Packages and Visibility - Package Member Visibility
8 important questions on Packages and Namespaces - Packages and Visibility - Package Member Visibility
In all the representations of Packages and their members shown above, we can precede the member name with a visibility indicator.
The allowed visibility adornment is based on the visibility adornments allowed on the members of a ...?
The visibility signs immediately precede the member name, usually after any ...?
We demonstrate this in Fig. 8.7, showing how it works with the three alternative member depiction approaches (physically placed inside, member list, or approaches).
Which Visibility Notations are there in packages?
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What is the Visibility Notation : Public + ?
A member with public visibility is visible to all elements that can access the contents of the Package (or Namespace) that owns it
What is the Visibility Notation : Package ~ ?
A member with Package visibility is visible within the nearest enclosing Package (given that any intermediate owning Elements have proper visibility). Outside the nearest enclosing Package, a NamedElement marked as having Package visibility is not visible
Not allowed on Packages or Elements directly owned by Packages
What is the Visibility Notation : Protected # ?
Not allowed on Packages or Elements directly owned by Packages.
Packages do not support generalization/specializations
Which two Visiblitys are Not allowed on Packages or Elements directly owned by Packages ?
- Protected
The interplay of the UML visibility notation in Packages is sometimes difficult to follow.
Consider Fig. 8.8 and the associated Table 8.2.
Try to read this figure![]()
It is easy to construct complicated visibility situations.
Table 8.2 illustrates the scope of visibility for some typical examples.
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