| Attribute | Schema Type or Enumeration Values | Usage | Definition | Business Rules |
|---|---|---|---|---|
| ItemGroupOID | oidref | Required | Reference to an ItemGroupDef for the MetaDataVersion identified in the ClinicalData element. | |
| ItemGroupRepeatKey | repeatKey | Conditional | A key used to distinguish between repeats of the same type of item group. | When the Repeating attribute for the ItemGroupDef element is "Yes" the ItemGroupRepeatKey must be unique within the parent element. |
| TransactionType | Insert | Update | Remove | Upsert | Context | Conditional | The TransactionType attribute need not be present in a Snapshot document. | When the FileType attribute for the ODM element is Transactional, the TransactionType must be provided. |
| ItemGroupDataSeq | integer | Conditional | Unique sequence # for each ItemGroupData child element (record) in the container element. | When the parent element is ReferenceData or ClinicalData, the ItemGroupDataSeq must be provided. |
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