|modifications||attributes EndTime definition||Changed from IfcDateTimeSelect to IfcDateTime|
|modifications||attributes StartTime definition||Changed from IfcDateTimeSelect to IfcDateTime|
|modifications||inverses DocumentedBy definition||Changed from SET OF [0:1] IfcTimeSeriesReferenceRelationship FOR ReferencedTimeSeries to SET OF [1:?] IfcExternalReferenceRelationship FOR RelatedResourceObjects|
|modifications||inverses DocumentedBy name||Changed from DocumentedBy to HasExternalReference|
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.
HISTORY New entity in IFC2x2.
|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. |
> IFC4 CHANGE New inverse attribute.
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;