Settings for attribute reflection

Where Class A has Attribute X and Class B has Attribute Y, the model can be set up so that an instance of B can have its value of Y reflect the value of X on an instance of A. If Y is set to a value on B then that value is used, but if Y is unset on B it appears to have the value of X on A.

In this example, the definition of Attribute Y must set which association to follow in order to get the value it is reflecting, and then which attribute to reflect.