This interface defines functionality required by ValueHolders for OneToOneMappings that
have LAZY access weaved into them and use Property (method) based access
The weaving feature adds a paralell valueholder to the class it weaves and uses that valueholder
to control the lazy loading.
IndirectSet is an example implementation of the Set protocol that
allows a domain class to take advantage of TopLink Indirection
without having to declare its instance variable as a ValueHolderInterface.