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Reasoning for a Product Registry to be located with the other registries: A Product Registry serves as the source of truth for defining products and their categorization(s) for the HIE. This role is similar in kind to other registries which serve as the source of truth for Facilities or Clients such as the Facility or Client Registries. A Product Registry does have some similarties similarities to a Terminology Service in that it will map equivalent product codes to one another, however as mentioned above the product registry adds additional capabilities specific to the nature of how product definitions are created, the roles of the various organizations involved in this process, and the external systems which already hold some of this data.