Each item in the derived statechart can be:
- Inherited where any modifications to an
item in the superclass is applied to the item in the subclass.
- Overridden where any modifications to an
item in the superclass do not apply to the subclass. However, deleting
an item from the superclass also deletes the item from the subclass. This is different from C++, for example, where deleting an overridden
behavior in the superclass causes the overridden behavior to become
a regular item.
- Regular where regular items are owned by
the subclass. The item is not related to the superclass and is not
affected by the superclass.
Noting the status of items as inherited, overridden,
or regular is crucial both for IBM® Rational® Rhapsody® and
the user.
Note: The current implementation of statechart inheritance
is restricted to single inheritance. A reactive class can have at
most one reactive superclass.