(Chapters 1 and 2 of this volume "Data Model" are the first part, which describes the data model in general, and Chapter 1 is an overview, which generally describes the basic background information of the document, and Chapter 2 For the general theory of the data model, it describes the starting point, scheme, design features and core model part (Level0) of the data model design; Chapters 3, 4, 5, 6, 7, and 8 are the second part, which describes the data model in detail. The overall design of the six entity data fields involved in the secondary data model, including the level1 and level2 of the data model; Chapters 9 and 10 are the third part, which is the design of data sharing, and Chapter 9 is the shared information data model. (SID), which describes the design starting point and detailed scope definition of shared information data, including a CRUD table, Chapter 10 is the design of the data middle layer, which describes the design of the data middle layer for statistical data provision; Chapter 11 Model Instance Verification is the fourth part, which records some typical example verification examples involved in the system design and verification process; Chapter 12 appendix is ??the fifth part, which records the coding standards, type definitions, and types involved in the data model. The main additional information touched by data models such as product listings. The main points of the document are the first, second, and third sections.)
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