"A time period defined by a start and end date and optionally time." HL7 FHIR, Period
This data type represents an Interval, where the Low and High Limits are Points In Time. An Interval is a "set of consecutive values of an ordered base data type." - HL7 V3 A PointInTime is "a quantity specifying a point on the axis of natural time. A point in time is most often represented as a calendar expression." - HL7 V3

Attributes
«TS» PointInTime	end	"The end of the period. If the end of the period is missing, it means no end was known or planned at the time the instance was created. The start may be in the past, and the end date in the future, which means that period is expected/planned to end at that time." HL7 FHIR, Period.end "The high limit of the interval. The high limit SHALL NOT be negative infinity, and SHALL be higher than the low limit if one exists." - HL7 V3
«TS» PointInTime	start	"The start of the period. The boundary is inclusive." HL7 FHIR, Period.start "The low limit of the interval. The low limit SHALL NOT be positive infinity." - HL7 V3

 end

Public «TS» PointInTime end

"The end of the period. If the end of the period is missing, it means no end was known or planned at the time the instance was created. The start may be in the past, and the end date in the future, which means that period is expected/planned to end at that time." HL7 FHIR, Period.end
"The high limit of the interval. The high limit SHALL NOT be negative infinity, and SHALL be higher than the low limit if one exists." - HL7 V3

Constraints:

Properties:

Aggregation	None
Alias
Association
Association End
Class	«IVL_TS» Period
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	end
Name Expression
Namespace	«IVL_TS» Period
Opposite
Owner	«IVL_TS» Period
Owning Association
Owning Template Parameter
Qualified Name	FHIM::Datatypes::Period::end
Stereotype
Template Parameter
Type	«TS» PointInTime
Upper	1
Upper Value	(1)
Visibility	Public

 start

Public «TS» PointInTime start

"The start of the period. The boundary is inclusive." HL7 FHIR, Period.start
"The low limit of the interval. The low limit SHALL NOT be positive infinity." - HL7 V3

Constraints:

Properties:

Aggregation	None
Alias
Association
Association End
Class	«IVL_TS» Period
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	start
Name Expression
Namespace	«IVL_TS» Period
Opposite
Owner	«IVL_TS» Period
Owning Association
Owning Template Parameter
Qualified Name	FHIM::Datatypes::Period::start
Stereotype
Template Parameter
Type	«TS» PointInTime
Upper	1
Upper Value	(1)
Visibility	Public

• An interval of time specified as an interval of points in time - TS.