| Usage/Business Rules | - Other Information:
- When a metadata element such as an ItemDef is redefined in a MetaDataVersion that includes a previous MetaDataVersion, any metadata element of the same type and with the same OID in a preceding MetaDataVersion is completely replaced. This includes all attributes and child elements. It also means that all attributes and child elements not present in the new definition are effectively deleted from the previous version.
- Definitions (e.g., ItemDef) that have been defined in a previous included MetaDataVersion cannot be removed in later MetaDataVersions; only references to those Items can be removed. Referenced Items are removed by redefining the parent definition (e.g., ItemGroupDef) and omitting the undesired reference.
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