To identify the specific rule/condition requirement.

Code qualifying identification of a subject area.

Code specifying a requirement or condition.

Code identifying a user or association maintained code list.

Code specifying the agency responsible for a code list.

Free form description of a requirement or condition.

Code specifying the action to be taken or already taken.

Identification of the name of the country or other geographical entity as defined in ISO 3166-1 and UN/ECE Recommendation 3.