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Parent Package: primitive
Class C_DURATION

C_PRIMITIVE
   |
   +--C_DURATION
ISO 8601-compatible constraint on instances of Duration. In ISO 8601 terms, constraints might are of the form “PWD” (weeks and/or days), “PDTHMS” (days, hours, minutes, seconds) and so on. In official ISO 8601:2004, the ‘W’ (week) designator cannot be mixed in; allowing it is an openEHR-wide exception.

Attributes
Signature	Optionality	Multiplicity	Constant	Documentation
assumed_value : Duration	0..1	--		The value to assume if this item is not included in data, due to being part of an optional structure.
days_allowed : Boolean	0..1	--		True if days are allowed in the constrained Duration.
fractional_seconds_allowed : Boolean	0..1	--		True if fractional seconds are allowed in the constrained Duration.
hours_allowed : Boolean	0..1	--		True if hours are allowed in the constrained Duration.
minutes_allowed : Boolean	0..1	--		True if minutes are allowed in the constrained Duration.
months_allowed : Boolean	0..1	--		True if months are allowed in the constrained Duration.
range : Interval<Duration>	0..1	--		Constraint on instances of Duration .
seconds_allowed : Boolean	0..1	--		True if seconds are allowed in the constrained Duration.
weeks_allowed : Boolean	0..1	--		True if weeks are allowed in the constrained Duration.
years_allowed : Boolean	0..1	--		True if years are allowed in the constrained Duration

Constraints
Name	Expression
range_valid	inv: range <> Void or (years_allowed or months_allowed or weeks_allowed or days_allowed or hours_allowed or minutes_allowed or seconds_allowed or fractional_seconds_allowed)