Discriminator
The discriminator is the general entity attribute whose value partitions the objects into the sub-entities associated with the generalization.
For example, the gender code attribute divides the objects in the person entity into the man and woman sub-entities.
To create a discriminator on a generalization:
1. Open properties of the generalization.
2. Click the drop-down list then Characteristics.
3. In the Discriminator field, click the arrow and select Connect Attribute (DM).
4. Find ans select the discriminator among the super-entity attributes.
Once selected, the discriminator is displayed on the generalization.
You can also indicate if the generalization is Complete: in this case all instances of the generic entity belong to at least one of the category entities of the generalization.