The logical data model in RDA is to databases as sketches are to designing a house.
RDA中的逻辑数据模型对于数据库的意义，就如同设计草图对于建造房屋的意义。
The design of logical models consists of two steps: designing the DWH logical model (CDW) followed by designing the DM logical model.
逻辑模型设计包含两个步骤：先设计DWH逻辑模型(CDW)，然后设计DM逻辑模型。
Phase 3: Designing the data warehouse logical model.
阶段3：设计数据仓库逻辑模型。
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