Optional_Optional_Fixed date for references with no specified version (transitive)
OptionalexcludeExplicitly exclude codes from a code system or other value sets
OptionalextensionAdditional content defined by implementations
OptionalidUnique id for inter-element referencing
OptionalinactiveWhether inactive codes are in the value set
Include one or more codes from a code system or other value set(s)
OptionallockedFixed date for references with no specified version (transitive)
OptionalmodifierExtensions that cannot be ignored even if unrecognized
Whether inactive codes are in the value set