This document describes the data modelling standards applied to the business data architecture (BDA).
The BDA needs to be distinguished from logical data models, physical data models and databases or physical data stores.
From an enterprise architecture perspective physical data stores, physical data models, logical data models and the business data architecture must all be integral, in that the physical data store is derived from the physical data model, the physical data model is derived from the logical data model and the logical data model is derived from, or at least mapped to, the business data architecture.
All of the models can be represented in the enterprise architecture, although not all of the lower level models will always be of interest from an enterprise architectural perspective. Where they are, it will usually be at a higher level of abstraction than that required by the project teams that are implementing solutions.