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

When applicable, variables IDVAR and IDVARVAL represent variables and values used as record-level keys to merge/join records between datasets. In such cases, variables represented in IDVAR may have:

• Unique values for each observation within a dataset.

1. When relationship datasets (e.g., SUPPxx, FAxx, CO, RELREC) relate back to split parent domains, the value of IDVAR will be from a variable with unique values for each observation. 

   1. When possible, the variable represented in IDVAR will have values from collected data (e.g., SPID, RECID), but variables with derived values may also be used (e.g., --SEQ).

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

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