- A length of time Base StructureDefinition for Duration Type: A length of time.
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Key: = Must support, = QICore-defined extension, = Is-Modifier
Field Card. Type and Description 
code 0..1StringA computer processable form of the unit in some unit representation system.comparator 0..1StringHow the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value.Binding: QuantityComparator (Required)
system 0..1StringThe identification of the system that provides the coded form of the unit.unit 0..1StringA human-readable form of the unit.value 0..1DecimalThe value of the measured amount. The value includes an implicit precision in the presentation of the value.Key: = Must support, = QICore-defined extension, = Is-Modifier
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