The identifier of the Identifier entity consists of one or more attributes, which uniquely determines an instance in the entity. Although the identifier of the entity is a characteristic of the entity, one or more attributes of the entity must be specified as the identifier of the entity. In the physical graphics symbol, the identifier property is underlined.
Cardinality (Base) In touch, the ratio of the number of instances in one entity is referred to as a base. The two directions of the contact should be defined (starting from each entity)
MANDATORY indicates whether the link between the entity is optional. It is enforced with a short straight line through the contact line in the model to represent an option with a small circle. Modifying the Cardinality value will also affect Mandatory, and then it is true.
Dependent (dependent) is between two modeling elements, where a modification of a modeling element (independent element) will affect another modeling element (dependent element).
