You can define references and choose how they are implemented.
A reference is an entity attribute where the value of
the attribute is the identifier of another entity. Creating a reference
is similar to creating an attribute or type code.
A reference
has the following properties:
- Name: The name of the reference.
- Documentation: Optional description of the reference.
- Documentation URL: Optional URL linking to documentation
for the attribute.
- Nullable: Whether the database column can contain null
as value.
- Reference type: The type of the entity. Click the … button
to select a type from the available entities.
- Entity field name: The name of the field in the Entity
object class.
- Database field name: The name of the database column corresponding
to this reference.