12. The computer program of claim 11 , wherein at least one of the explicit relationship definitions is representative of a hierarchical relationship adapted to reference at least one second explicit relationship definition.
12. The computer program of claim 11 , wherein at least one of the explicit relationship definitions is representative of a hierarchical relationship adapted to reference at least one second explicit relationship definition. 13. The computer program of claim 12 , wherein validating further comprises traversing a hierarchy associated with the hierarchical relationship.