Metamodeling languages: Binding

• 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
    • Role instances: note cardinality constraint

• Together with a participation, this forms a binding

  • Each role type in a binding is characterized with a cardinality constraint describing
    • how many instances of this role type must (minimum) or
    • may (maximum) occur in an instantiation of this binding

• Graph constraints for binary/n-ary relationships

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