1. A computer-implemented system for centrally managing core enterprise reference data associated with an enterprise, comprising: a centralized master repository containing the core enterprise reference data; an internal services framework coupled to the centralized master repository, the internal services framework operable to: provide a business process toolkit for managing models associated with the system, the business process toolkit comprising: a model library containing data models; and one or more modeling services for modeling the system, its structure, and its components; and provide internal services for managing the core enterprise reference data within the centralized master repository, one or more of the internal services having direct access to the core enterprise reference data stored in the centralized master repository for management purposes; and an infrastructure services layer coupled to the centralized master repository for providing bulk data transfers of core enterprise reference data between the centralized master repository and one or more external operational systems according to one or more enterprise-level business workflows, the external operational systems permitted indirect access to the core enterprise reference data stored in the centralized master repository for operational purposes.