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Element Name	ItemRef
Parent Element(s)	ValueListDef ItemGroupDef
Element XPath(s)	/ODM/Study/MetaDataVersion/ValueListDef/ItemRef /ODM/Study/MetaDataVersion/ItemGroupDef/ItemRef
Element Textual Value	None
Attributes	ItemOID, KeySequence, IsNonStandard, HasNoData, MethodOID, UnitsItemOID, Repeat, Other, Role, RoleCodeListOID, OrderNumber, Mandatory, CollectionExceptionConditionOID, Core, PreSpecifiedValue
Child Elements	(Origin, WhereClauseRef)
Usage/Business Rules	Business Rule(s): For Conditional: for each ItemDef in a MetaDataVersion element there must be at least one ItemRef where the ItemRef/@ItemOID atttribute attribute matches ItemDef/@OID attrbiute attribute.
Attributes	ItemOID, Mandatory, OrderNumber, KeySequence, MethodOID, UnitsItemOID, Role, RoleCodeListOID, CollectionExceptionConditionOID
Other Information: The "Other" attribute is also used in the CodeListItem element.	Child Elements	Origin*, WhereClauseRef?

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