Logical data model: Logical data model represents the enterprise entities, their attributes (data) and the relationship among them.
逻辑数据模型：逻辑数据模型代表企业实体、实体属性(数据)，以及它们之间的关系。
System on the logical relationship from the data acquisition is divided into layers, layer analysis of monitoring, management and exchange transport layer.
系统从逻辑关系上分为数据采集层、分析监测层、管理层和交流传输层。
Put forward the concepts involved in the data model of the object in a logical environment, whose essentials are object and relationship.
提出在逻辑环境下对象的数据模型应涉及到的概念，其基本概念是对象和联系。
应用推荐