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

When applicable, variables IDVAR and IDVARVAL will represent variables variable and values value pairs used as record-level keys to merge/join records between datasets. In such cases, variables represented in IDVAR may have values that are unique for:

• Unique values for each 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

 The following are examples of variables that could be used in IDVAR:

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1. When possible, the variable represented in IDVAR will have values from collected data 

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• Groups of records in a dataset.

The uniqueness of values by observation or groups of observations

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