6. The computer program product of claim 1 wherein the set of objects are source objects within an object inheritance hierarchy.
6. The computer program product of claim 1 wherein the set of objects are source objects within an object inheritance hierarchy. 7. The computer program product of claim 6 wherein the set of metadata sources are the source objects within the object inheritance hierarchy, and determining the number of references to a source object within the inheritance hierarchy comprises examining each of the source objects.