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If IsReferenceData is Yes, this type of item group can occur only within a ReferenceData element. If IsReferenceData is No, this type of item group can occur only within a ClinicalData element. The default for this attribute is No.
In general, the Domain and Purpose attributes, as well as the Origin child element, carry information used in the submission context. The CommentOID attribute references a CommentDef element that allows annotations to the item group.
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ODM v2.0 introduces nested ItemGroups, and . ItemGroupRef elements may be added to ItemGroupDef to create hierarchical data structures of arbitrary depthsdepth. Nested ItemGroupDefs can be used for enhanced re-usability of ItemGroups, to . They can also represent semantic relationships between items, to represent items that share common behaviors such as skip logic, and or to represent items that are displayed or collected together.
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