Represents a "back-reference" to the id of a collection owner. A "back-reference" is pertinent in mapping scenarios where we have a uni-directional one-to-many association in which only the many side is mapped. In this case it is the collection itself which is responsible for the FK value.
In this scenario, the one side has no inherent knowledge of its "owner". So we introduce a synthetic property into the one side to represent the association; a so-called back-reference.
@author Gavin King
@author Steve Ebersole