7. Define bindings, role cardinalities and constraints
Bindings define how the relations, roles and objects are connected to each other
- Participation
- An object type can participate in zero to many role types.
- In a graph type, a role type must be related to at least one object type.
- Composition
- Relationship types are related with at least two compositions to role instances
- Note: Role instances!
- Role type can be the same
- see cardinality constraints