Overlapping and disjoint specialization examples

1. What is overlapping specialization?
2. What is the difference between disjoint and overlapping?
3. Which one is the example of disjointness constraints?
4. What is disjoint and overlapping rule?

What is overlapping specialization?

In a disjoint specialization, also called an exclusive specialization, an individual of the parent class may be a member of only one specialized subclass. In an overlapping specialization, an individual of of the parent class may be a member of more than one of the specialized subclasses.

What is the difference between disjoint and overlapping?

Disjoint events are events that don't have any outcomes in common. Overlapping events are events that have outcomes in common. Then, determine whether the events are disjoint or overlapping. You can do this by drawing a Venn diagram that shows if any events are common to the two sets.

Which one is the example of disjointness constraints?

If the value of a discriminator is not null and appears in supertype entity instance then that must be linked with the only one subtype. This is called disjoint constraint. For example, you say in school a person can be teacher and student but a teacher can't be a student and vice versa.

What is disjoint and overlapping rule?

The disjoint rule forces subclasses to have disjoint sets of entities. The overlap rule forces a subclass (also known as a supertype instance) to have overlapping sets of entities. Completeness constraints - decide whether a supertype instance must also be a member of at least one subtype.