Property controlInformationExtension : WideString; (Read/Write)
The extension of the identifier of the event associated with setting the datatype to its specified value.
Together, the root and extension identify a particular record of a real world event that may supply additional information about the value such as who made the change, when it was made, why it was made, what system originated the change. These attributes exist because sometimes this information is required, but the value is being represented in an external context that does not contain a proper relationship to the control information for the value itself. The record need not be directly or easily resolvable. Conformance statements may make additional statements about these two properties, or about how such a reference should be resolved.