IFC 4.3.0.1 (IFC4X3) development

5.2.3.1 IfcPerformanceHistory

5.2.3.1.1 Semantic definition

IfcPerformanceHistory is used to document the actual performance of an occurrence instance over time. It includes machine-measured data from building automation systems and human-specified data such as task and resource usage. The data may represent actual conditions, predictions, or simulations.

The realtime data tracked by performance history takes the form of property sets where all properties are based on time series. Unlike design-based data at occurrences and types, performance-driven data is time-sensitive and may change in realtime by some measurement device. Data may be captured at irregular intervals such as when values change beyond established thresholds, or at regular intervals of specified duration.

5.2.3.1.1.1 Declaration use definition

IfcPerformanceHistory may be declared within a project using IfcRelDeclares where RelatingContext refers to the IfcProject and RelatedDefinitions includes the IfcPerformanceHistory. Default units (used for property sets) are indicated by the declaring project. Only top-level objects are declared; nested performance history objects (through IfcRelNests) do not participate in such relationship.

5.2.3.1.2 Entity inheritance

5.2.3.1.3 Attributes

# Attribute Type Description
IfcRoot (4)
1 GlobalId IfcGloballyUniqueId

Assignment of a globally unique identifier within the entire software world.

2 OwnerHistory OPTIONAL IfcOwnerHistory

Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object,

3 Name OPTIONAL IfcLabel

Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule.

4 Description OPTIONAL IfcText

Optional description, provided for exchanging informative comments.

IfcObjectDefinition (7)
HasAssignments SET [0:?] OF IfcRelAssigns FOR RelatedObjects

Reference to the relationship objects, that assign (by an association relationship) other subtypes of IfcObject to this object instance. Examples are the association to products, processes, controls, resources or groups.

Nests SET [0:1] OF IfcRelNests FOR RelatedObjects

References to the decomposition relationship being a nesting. It determines that this object definition is a part within an ordered whole/part decomposition relationship. An object occurrence or type can only be part of a single decomposition (to allow hierarchical strutures only).

IsNestedBy SET [0:?] OF IfcRelNests FOR RelatingObject

References to the decomposition relationship being a nesting. It determines that this object definition is the whole within an ordered whole/part decomposition relationship. An object or object type can be nested by several other objects (occurrences or types).

HasContext SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions

References to the context providing context information such as project unit or representation context. It should only be asserted for the uppermost non-spatial object.

IsDecomposedBy SET [0:?] OF IfcRelAggregates FOR RelatingObject

References to the decomposition relationship being an aggregation. It determines that this object definition is whole within an unordered whole/part decomposition relationship. An object definitions can be aggregated by several other objects (occurrences or parts).

Decomposes SET [0:1] OF IfcRelAggregates FOR RelatedObjects

References to the decomposition relationship being an aggregation. It determines that this object definition is a part within an unordered whole/part decomposition relationship. An object definitions can only be part of a single decomposition (to allow hierarchical strutures only).

HasAssociations SET [0:?] OF IfcRelAssociates FOR RelatedObjects

Reference to the relationship objects, that associates external references or other resource definitions to the object.. Examples are the association to library, documentation or classification.

IfcObject (5)
5 ObjectType OPTIONAL IfcLabel

The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute PredefinedType is set to USERDEFINED.

IsDeclaredBy SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects

Link to the relationship object pointing to the declaring object that provides the object definitions for this object occurrence. The declaring object has to be part of an object type decomposition. The associated IfcObject, or its subtypes, contains the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.

Declares SET [0:?] OF IfcRelDefinesByObject FOR RelatingObject

Link to the relationship object pointing to the reflected object(s) that receives the object definitions. The reflected object has to be part of an object occurrence decomposition. The associated IfcObject, or its subtypes, provides the specific information (as part of a type, or style, definition), that is common to all reflected instances of the declaring IfcObject, or its subtypes.

IsTypedBy SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects

Set of relationships to the object type that provides the type definitions for this object occurrence. The then associated IfcTypeObject, or its subtypes, contains the specific information (or type, or style), that is common to all instances of IfcObject, or its subtypes, referring to the same type.

IsDefinedBy SET [0:?] OF IfcRelDefinesByProperties FOR RelatedObjects

Set of relationships to property set definitions attached to this object. Those statically or dynamically defined properties contain alphanumeric information content that further defines the object.

IfcControl (2)
6 Identification OPTIONAL IfcIdentifier

An identifying designation given to a control It is the identifier at the occurrence level.

Controls SET [0:?] OF IfcRelAssignsToControl FOR RelatingControl

Reference to the relationship that associates the control to the object(s) being controlled.

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IfcPerformanceHistory (2)
7 LifeCyclePhase IfcLabel

Describes the applicable building life-cycle phase. Typical values should be DESIGNDEVELOPMENT, SCHEMATICDEVELOPMENT, CONSTRUCTIONDOCUMENT, CONSTRUCTION, ASBUILT, COMMISSIONING, OPERATION, etc.

8 PredefinedType OPTIONAL IfcPerformanceHistoryTypeEnum

Predefined generic type for a performance history that is specified in an enumeration.

Table 5.2.3.1.1.1.A

5.2.3.1.4 Concept usage

Concept Usage Description
IfcRoot (2)
Revision Control General

Ownership, history, and merge state is captured using IfcOwnerHistory.

Software Identity General

IfcRoot assigns the globally unique ID. In addition it may provide for a name and a description about the concept.

IfcObjectDefinition (9)
Aggregation General

No description available.

Approval Association General

No description available.

Classification Association General

Any object occurrence or object type can have a reference to a specific classification reference, i.e. to a particular facet within a classification system.

Constraint Association General

No description available.

Document Association General

No description available.

Library Association General

No description available.

Material Association General

No description available.

Material Single General

No description available.

Nesting General

No description available.

IfcObject (5)
Assignment to Group General

No description available.

Object Predefined Type General

No description available.

Object Typing General

Any object occurrence can be typed by being assigned to a common object type utilizing this concept. A particular rule, restricting the applicable subtypes of IfcTypeObject that can be assigned, is introduced by overriding this concept at the level of subtypes of IfcObject.

This concept can be applied to the following resources:

Object User Identity General

An attribute Name and optionally Description can be used for all subypes of IfcObject. For those subtypes, that have an object type definition, such as ifcBeam - IfcBeamType, the common Name and optionally Description is associated with the object type.

Property Sets with Override General

Any object occurrence can hold property sets, either directly at the object occurrence as element specific property sets, or at the object type, as type property sets. In this case, the properties that are provided to the object occurrence are the combinations of element specific and type properties. In case, that the same property (within the same property set, is defined both, in occurrence and type properties, the property value of the occurrence property overrides the property value of the type property.

IfcControl (1)
Control Assignment General

Controls have assignments from products, processes, or other objects by using the relationship object IfcRelAssignsToControl.

This concept can be applied to the following resources:

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IfcPerformanceHistory (3)
Aggregation General

IfcPerformanceHistory may be decomposed into components using IfcRelNests where RelatingObject refers to the enclosing IfcPerformanceHistory and RelatedObjects contains one or more IfcPerformanceHistory components. Composition indicates breakdown of further detail and may correspond to the hierarchy of objects it represents.

Control Assignment General

This concept can be applied to the following resources:

  • IfcGroup - A system or zone for which time-based system information is provided, such as overall status parameters of a building control system.
  • IfcProduct - A building space, physical device, or port for which time-based information is provided, such as a chiller or an analog input within a device.
  • IfcProcess - A process for which time-based information is provided, such as an alarm event being raised and acknowledged, or regular and overtime costs incurred for a task.
  • IfcResource - A resource for which usage is recorded or planned over time, such as wage rates and number of workers at particular times.
Library Association General

IfcPerformanceHistory may refer to external systems, such as a time series data source within a building automation system or a cost code in an accounting system for resource allocation.

Table 5.2.3.1.1.1.B

5.2.3.1.5 Formal representation

ENTITY IfcPerformanceHistory
 SUBTYPE OF (IfcControl);
	LifeCyclePhase : IfcLabel;
	PredefinedType : OPTIONAL IfcPerformanceHistoryTypeEnum;
END_ENTITY;

5.2.3.1.6 References

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5.2.3.1.7 Changelog

  • attribute, PredefinedType