If, however, the majority of your data fits better in a highly structured entity-relationshipmodel and is less document-like and more intertwined, then choosing an NXD might not help your situation.
The object-oriented model includes many of the concepts of the entity-relationshipmodel, but represents executable code as well as data.
物件定向的模型含实质- 联系的模型许多观念， 但是表现可运行的码和数据。
3
The final ERD (entityrelationshipmodel diagram) and system datum dictionary are given through data sheets normalization during logic design and physical design.