8.5.3.12 IfcTimeSeries

8.5.3.12.1 Semantic definition

A time series is a set of a time-stamped data entries. It allows a natural association of data collected over intervals of time. Time series can be regular or irregular. In regular time series data arrive predictably at predefined intervals. In irregular time series some or all time stamps do not follow a repetitive pattern and unpredictable bursts of data may arrive at unspecified points in time.

The modeling of buildings and their performance involves data that are generated and recorded over a period of time. Such data cover a large spectrum, from weather data to schedules of all kinds to status measurements to reporting to everything else that has a time related aspect. Their correct placement in time is essential for their proper understanding and use, and the IfcTimeSeries subtypes provide the appropriate data structures to accommodate these types of data.

8.5.3.12.2 Entity inheritance

1. • IfcTimeSeries
2. • IfcIrregularTimeSeries
   • IfcRegularTimeSeries

8.5.3.12.3 Attributes

#	Attribute	Type	Description
IfcTimeSeries (9)
1	Name	IfcLabel	An unique name for the time series.
2	Description	OPTIONAL IfcText	A text description of the data that the series represents.
3	StartTime	IfcDateTime	The start time of a time series.
4	EndTime	IfcDateTime	The end time of a time series.
5	TimeSeriesDataType	IfcTimeSeriesDataTypeEnum	The time series data type.
6	DataOrigin	IfcDataOriginEnum	The origin of a time series data.
7	UserDefinedDataOrigin	OPTIONAL IfcLabel	Value of the data origin if DataOrigin attribute is USERDEFINED.
8	Unit	OPTIONAL IfcUnit	The unit to be assigned to all values within the time series. Note that mixing units is not allowed. If the value is not given, the global unit for the type of IfcValue, as defined at IfcProject.UnitsInContext is used.
	HasExternalReference	SET [1:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects	Reference to an external reference, e.g. library, classification, or document information, that is associated to the IfcTimeSeries.

8.5.3.12.4 Formal representation

ENTITY IfcTimeSeries
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcIrregularTimeSeries
	,IfcRegularTimeSeries));
	Name : IfcLabel;
	Description : OPTIONAL IfcText;
	StartTime : IfcDateTime;
	EndTime : IfcDateTime;
	TimeSeriesDataType : IfcTimeSeriesDataTypeEnum;
	DataOrigin : IfcDataOriginEnum;
	UserDefinedDataOrigin : OPTIONAL IfcLabel;
	Unit : OPTIONAL IfcUnit;
 INVERSE
	HasExternalReference : SET [1:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects;
END_ENTITY;

8.5.3.12.5 References

• IfcIrregularTimeSeries
• IfcMetricValueSelect
• IfcObjectReferenceSelect
• IfcRegularTimeSeries
• IfcResourceObjectSelect