• 1. logical database description: 逻辑数据库描述
• 2. global logical database description: 总体逻辑数据库描述

• 1.Record-based logical models define the overall logical structure of the database as well as higher level description of its implementation.
  基于记录的逻辑模型定义数据库的整个逻辑结构以及实现的更高级描述。
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