In this paper, we analyze the shortcomings of hierarchical structure, and build product model with extended entity relationship ( EER) approach. A product model of fuel pump is shown as an example. 该文分析了递阶结构表达方式的不足,利用扩展的实体关联(EER)表达方式建立了产品的数据模型,并以油泵产品为例建立了产品数据模型的展开结构。
The conceptual model of the discipline architecture is represented through an extended entity-relationship approach. 用扩展的实体&联系方法描述学科体系结构的概念模型。