A directed relationship references one or more source elements and one or more target elements. DirectedRelationship is an abstract metaclass.
Attributes
No additional attributes.
Associations
No additional constraints.
Semantics
DirectedRelationship has no specific semantics. The various subclasses of DirectedRelationship will add semantics appropriate to the concept they represent.
Notation
There is no general notation for a DirectedRelationship. The specific subclasses of DirectedRelationship will define their own notation. In most cases the notation is a variation on a line drawn from the source(s) to the target(s).