This class adds to the Period class a duration property, which is the length of time between the start and end date/times. While this may be calculated when the start and end date/times are known, there will be occasions where only the start or the end date/time are known.

Attributes
«PQ» TimeQuantity	duration	"The difference between HIGH and LOW boundary. The purpose of distinguishing width is to handle all cases of incomplete information symmetrically. In any IVL representation only two of the three properties HIGH, LOW, and width need to be stated: the third can be derived. When both boundaries are known, width can be derived as HIGH minus LOW. When one boundary and width is known, the other boundary is also known. When no boundary is known, width may still be known. For example, one knows that an activity takes about 30 minutes, but one may not yet know when that activity is started." - HL7 V3

Attributes inherited from  FHIM::Datatypes::Period

start,  end

 duration

Public «PQ» TimeQuantity duration

"The difference between HIGH and LOW boundary. The purpose of distinguishing width is to handle all cases of incomplete information symmetrically. In any IVL representation only two of the three properties HIGH, LOW, and width need to be stated: the third can be derived. When both boundaries are known, width can be derived as HIGH minus LOW. When one boundary and width is known, the other boundary is also known. When no boundary is known, width may still be known. For example, one knows that an activity takes about 30 minutes, but one may not yet know when that activity is started." - HL7 V3

Constraints:

Properties:

Aggregation	None
Alias
Association
Association End
Class	«IVL_TS» TimeInterval
Datatype
Default
Default Value
Is Composite	false
Is Derived	false
Is Derived Union	false
Is Leaf	false
Is Ordered	false
Is Read Only	false
Is Static	false
Is Unique	true
Keywords
Lower	0
Lower Value	(0)
Multiplicity	0..1
Name	duration
Name Expression
Namespace	«IVL_TS» TimeInterval
Opposite
Owner	«IVL_TS» TimeInterval
Owning Association
Owning Template Parameter
Qualified Name	FHIM::Datatypes::TimeInterval::duration
Stereotype
Template Parameter
Type	«PQ» TimeQuantity
Upper	1
Upper Value	(1)
Visibility	Public