Reference Relationships

Reference relationships define meaningful connections between entities that exist in addition to the entities' containment relationships. For example, a policy model may have two entities 'the student' and 'the teacher'. Each of these could have a containment relationship from the global entity called "the students" and "the teachers" respectively. There could also be an additional reference relationship called "the student's teachers", which is a many-to-many relationship between instances of the student entity and the teacher entity.