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For ItemDef elements that reference a CodeList element containing CodeListItem child elements, ItemData values must match a CodedValue attribute.

The CodedValue must be an acceptable value of the DataType of the containing CodeList.

The CodeListItems within a single CodeList must not have duplicate CodedValues (as interpreted by the CodeList's DataType).

Numeric significance of the CodeListItem relative to others in the CodeList.

The Rank attribute may be used where the relative value corresponding to an enumeration cannot or should not be determined by its lexical order. For example, if you have a list of enumerated text values including "Low", "Medium", and "High" and wish to assign these relative numeric values 1, 2, and 3 respectively, you should include a Rank attribute for each CodeListItem defined. Without the applied rank attribute, the normal lexical ordering would be "High", "Low", and "Medium".

If Rank is provided for any CodeListItem in a CodeList, it must be provided for all and values must be unique.

Ordering on the

CodeListItems (within a containing CodeListItem) for use whenever a list of Items is presented to a user.

The ordering does not imply anything about event scheduling, time ordering, or data correctness.

OrderNumber must be a positive integer.
If OrderNumber is provided for any CodeListItem, it must be provided for all and values must be unique.Note: the OrderNumber values provide an ordering on the CodeListItems (within a containing CodeList) for use whenever a list of CodeList Items is presented to a user. They do not imply anything about event scheduling, time ordering, or data correctness.