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This section describes how the SDTM may will be implemented to describe relationships between records in the same dataset and between records in different datasets. 

All relationships are represented  standard domain identifiers STUDYID, DOMAIN, and USUBJID. Variables When applicable, variables IDVAR and IDVARVAL are represent variables and values used as applicable to represent record-level keys to merge/join keys records between datasets.



In such cases, IDVAR and IDVARVAL the names of variables and specific variable values which relate records by acting as

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