一. Excel文件:SDTM_Metadata.xlsx
1.Table of Contents Metadata
2.Variable-Level Metadata
3.Codelist Metadata
4.Value-Level Metadata
5.Where Clause Metadata
6.Computational Method Metadata
7.Comments Metadata
8.External Links
二.使用Base SAS 实现SDTM
流程：
1.Creating an SDTM Codelist SAS Format Catalog
2.Creating an Empty SDTM Domain Dataset
3.Creating an SDTM --DTC Date Variable
4.Creating an SDTM Study Day Variable
5.Sorting the Final SDTM Domain Dataset
最后，就可以Building SDTM Datasets。
比如：Building the Special-Purpose DM and SUPPDM Domains