5.4.3.18 IfcElement

5.4.3.18.1 Semantic definition

An element is a generalization of all components that make up a facility.

Elements are physically existent objects, although they might be void elements, such as holes. Elements either remain permanently in the facility, or only temporarily, as formwork does. Elements can be either assembled on site or pre-manufactured and built in on site.

The elements can be logically contained by a spatial structure element that constitutes a certain level within a project structure hierarchy (site, building, storey or space). This is done by using the IfcRelContainedInSpatialStructure relationship. An element can have material and quantity information assigned through the IfcRelAssociatesMaterial and IfcRelDefinesByProperties relationship.

In addition an element can be declared to be a specific occurrence of an element type (and thereby be defined by the element type properties) using the IfcRelDefinesByType relationship. An element can also be defined as an element assembly that is a group of semantically and topologically related elements that form a higher level part of the facility. Those element assemblies are defined by virtue of the IfcRelAggregates relationship.

Elements that perform the same function may be grouped by an "Element Group By Function". It is realized by an instance of IfcGroup with the ObjectType ='ElementGroupByFunction'.

5.4.3.18.2 Entity inheritance

1. • IfcRoot
2. • IfcObjectDefinition
   • IfcPropertyDefinition
   • IfcRelationship
3. • IfcObject
   • IfcContext
   • IfcTypeObject
4. • IfcProduct
   • IfcActor
   • IfcControl
   • IfcGroup
   • IfcProcess
   • IfcResource
5. • IfcElement
   • IfcAnnotation
   • IfcLinearElement
   • IfcPort
   • IfcPositioningElement
   • IfcSpatialElement
   • IfcStructuralActivity
   • IfcStructuralItem
6. • IfcBuiltElement
   • IfcCivilElement
   • IfcDistributionElement
   • IfcElementAssembly
   • IfcElementComponent
   • IfcFeatureElement
   • IfcFurnishingElement
   • IfcGeographicElement
   • IfcGeotechnicalElement
   • IfcTransportationDevice
   • IfcVirtualElement

5.4.3.18.3 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 structures 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 definition 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 definition can only be part of a single decomposition (to allow hierarchical structures 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 or when the concrete entity instantiated does not have a PredefinedType attribute. The latter is the case in some exceptional leaf classes and when instantiating IfcBuiltElement directly.
	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.
IfcProduct (5)
6	ObjectPlacement	OPTIONAL IfcObjectPlacement	This establishes the object coordinate system and placement of the product in space. The placement can either be absolute (relative to the world coordinate system), relative (relative to the object placement of another product), or constrained (e.g. relative to grid axes, or to a linear positioning element). The type of placement is determined by the various subtypes of IfcObjectPlacement. An object placement must be provided if a representation is present.
7	Representation	OPTIONAL IfcProductRepresentation	Reference to the representations of the product, being either a representation (IfcProductRepresentation) or as a special case of a shape representation (IfcProductDefinitionShape). The product definition shape provides for multiple geometric representations of the shape property of the object within the same object coordinate system, defined by the object placement.
	ReferencedBy	SET [0:?] OF IfcRelAssignsToProduct FOR RelatingProduct	Reference to the IfcRelAssignsToProduct relationship, by which other products, processes, controls, resources or actors (as subtypes of IfcObjectDefinition) can be related to this product.
	PositionedRelativeTo	SET [0:?] OF IfcRelPositions FOR RelatedProducts	Reference to the IfcRelPositions relationship, which defines its relationship with a positioning element.
	ReferencedInStructures	SET [0:?] OF IfcRelReferencedInSpatialStructure FOR RelatedElements	Reference to the objectified relationship IfcRelReferencedInSpatialStructure may be used to relate a product to one or more spatial structure elements in addition to the one in which it is primarily contained.
Click to show 21 hidden inherited attributes Click to hide 21 inherited attributes
IfcElement (13)
8	Tag	OPTIONAL IfcIdentifier	The tag (or label) identifier at the particular instance of a product, e.g. the serial number, or the position number. It is the identifier at the occurrence level.
	FillsVoids	SET [0:1] OF IfcRelFillsElement FOR RelatedBuildingElement	Reference to the IfcRelFillsElement relationship that puts the element as a filling into the opening created within another element.
	ConnectedTo	SET [0:?] OF IfcRelConnectsElements FOR RelatingElement	Reference to the element connection relationship. The relationship then refers to the other element to which this element is connected to.
	IsInterferedByElements	SET [0:?] OF IfcRelInterferesElements FOR RelatedElement	Reference to the interference relationship to indicate the element that is interfered. The relationship, if provided, indicates that this element has an interference with one or many other elements.
	InterferesElements	SET [0:?] OF IfcRelInterferesElements FOR RelatingElement	Reference to the interference relationship to indicate the element that interferes. The relationship, if provided, indicates that this element has an interference with one or many other elements.
	HasProjections	SET [0:?] OF IfcRelProjectsElement FOR RelatingElement	Projection relationship that adds a feature (using a Boolean union) to the IfcBuiltElement.
	HasOpenings	SET [0:?] OF IfcRelVoidsElement FOR RelatingBuildingElement	Reference to the IfcRelVoidsElement relationship that creates an opening in an element. An element can incorporate zero-to-many openings. For each opening, that voids the element, a new relationship IfcRelVoidsElement is generated.
	IsConnectionRealization	SET [0:?] OF IfcRelConnectsWithRealizingElements FOR RealizingElements	Reference to the connection relationship with realizing element. The relationship, if provided, assigns this element as the realizing element to the connection, which provides the physical manifestation of the connection relationship.
	ProvidesBoundaries	SET [0:?] OF IfcRelSpaceBoundary FOR RelatedBuildingElement	Reference to space boundaries by virtue of the objectified relationship IfcRelSpaceBoundary. It defines the concept of an element bounding spaces.
	ConnectedFrom	SET [0:?] OF IfcRelConnectsElements FOR RelatedElement	Reference to the element connection relationship. The relationship then refers to the other element that is connected to this element.
	ContainedInStructure	SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements	Containment relationship to the spatial structure element, to which the element is primarily associated. This containment relationship has to be hierarchical, i.e. an element may only be assigned directly to zero or one spatial structure.
	HasCoverings	SET [0:?] OF IfcRelCoversBldgElements FOR RelatingBuildingElement	Reference to IfcCovering by virtue of the objectified relationship IfcRelCoversBldgElements. It defines the concept of an element having coverings associated.
	HasSurfaceFeatures	SET [0:?] OF IfcRelAdheresToElement FOR RelatingElement	Reference to the IfcRelAdheresToElement relationship that adheres a IfcSurfaceFeature to an element. An element can incorporate zero-to-many surface features in one relationship.

5.4.3.18.4 Property sets

• Pset_Condition
  • AssessmentDate
  • AssessmentCondition
  • AssessmentDescription
  • AssessmentType
  • AssessmentMethod
  • LastAssessmentReport
  • NextAssessmentDate
  • AssessmentFrequency
• Pset_ConstructionAdministration
  • ProcurementMethod
  • SpecificationSectionNumber
  • SubmittalIdentifer
• Pset_ConstructionOccurence
  • InstallationDate
  • ModelNumber
  • TagNumber
  • AssetIdentifier
• Pset_ElementKinematics
  • CyclicPath
  • CyclicRange
  • LinearPath
  • LinearRange
  • MaximumAngularVelocity
  • MaximumConstantSpeed
  • MinimumTime
• Pset_EnvironmentalCondition
  • ReferenceAirRelativeHumidity
  • ReferenceEnvironmentTemperature
  • MaximumAtmosphericPressure
  • StorageTemperatureRange
  • MaximumWindSpeed
  • OperationalTemperatureRange
  • MaximumRainIntensity
  • SaltMistLevel
  • SeismicResistance
  • SmokeLevel
  • MaximumSolarRadiation
• Pset_EnvironmentalImpactIndicators
  • Reference
  • FunctionalUnitReference
  • IndicatorsUnit
  • LifeCyclePhase
  • ExpectedServiceLife
  • TotalPrimaryEnergyConsumptionPerUnit
  • WaterConsumptionPerUnit
  • HazardousWastePerUnit
  • NonHazardousWastePerUnit
  • ClimateChangePerUnit
  • AtmosphericAcidificationPerUnit
  • RenewableEnergyConsumptionPerUnit
  • NonRenewableEnergyConsumptionPerUnit
  • ResourceDepletionPerUnit
  • InertWastePerUnit
  • RadioactiveWastePerUnit
  • StratosphericOzoneLayerDestructionPerUnit
  • PhotochemicalOzoneFormationPerUnit
  • EutrophicationPerUnit
• Pset_EnvironmentalImpactValues
  • TotalPrimaryEnergyConsumption
  • WaterConsumption
  • HazardousWaste
  • NonHazardousWaste
  • ClimateChange
  • AtmosphericAcidification
  • RenewableEnergyConsumption
  • NonRenewableEnergyConsumption
  • ResourceDepletion
  • InertWaste
  • RadioactiveWaste
  • StratosphericOzoneLayerDestruction
  • PhotochemicalOzoneFormation
  • Eutrophication
  • LeadInTime
  • Duration
  • LeadOutTime
• Pset_InstallationOccurrence
  • InstallationDate
  • AcceptanceDate
  • PutIntoOperationDate
• Pset_MaintenanceStrategy
  • AssetCriticality
  • AssetFrailty
  • AssetPriority
  • MonitoringType
  • AccidentResponse
• Pset_MaintenanceTriggerCondition
  • ConditionTargetPerformance
  • ConditionMaintenanceLevel
  • ConditionReplacementLevel
  • ConditionDisposalLevel
• Pset_MaintenanceTriggerDuration
  • DurationTargetPerformance
  • DurationMaintenanceLevel
  • DurationReplacementLevel
  • DurationDisposalLevel
• Pset_MaintenanceTriggerPerformance
  • TargetPerformance
  • PerformanceMaintenanceLevel
  • ReplacementLevel
  • DisposalLevel
• Pset_ManufacturerOccurrence
  • AcquisitionDate
  • BarCode
  • SerialNumber
  • BatchReference
  • AssemblyPlace
  • ManufacturingDate
• Pset_ManufacturerTypeInformation
  • GlobalTradeItemNumber
  • ArticleNumber
  • ModelReference
  • ModelLabel
  • Manufacturer
  • ProductionYear
  • AssemblyPlace
  • OperationalDocument
  • SafetyDocument
  • PerformanceCertificate
• Pset_RepairOccurrence
  • RepairContent
  • RepairDate
  • MeanTimeToRepair
• Pset_Risk
  • RiskName
  • RiskType
  • NatureOfRisk
  • RiskAssessmentMethodology
  • UnmitigatedRiskLikelihood
  • UnmitigatedRiskConsequence
  • UnmitigatedRiskSignificance
  • MitigationPlanned
  • MitigatedRiskLikelihood
  • MitigatedRiskConsequence
  • MitigatedRiskSignificance
  • MitigationProposed
  • AssociatedProduct
  • AssociatedActivity
  • AssociatedLocation
• Pset_ServiceLife
  • ServiceLifeDuration
  • MeanTimeBetweenFailure
• Pset_Tolerance
  • ToleranceDescription
  • ToleranceBasis
  • OverallTolerance
  • HorizontalTolerance
  • OrthogonalTolerance
  • VerticalTolerance
  • PlanarFlatness
  • HorizontalFlatness
  • ElevationalFlatness
  • SideFlatness
  • OverallOrthogonality
  • HorizontalOrthogonality
  • OrthogonalOrthogonality
  • VerticalOrthogonality
  • OverallStraightness
  • HorizontalStraightness
  • OrthogonalStraightness
  • VerticalStraightness
• Pset_Uncertainty
  • UncertaintyBasis
  • UncertaintyDescription
  • HorizontalUncertainty
  • LinearUncertainty
  • OrthogonalUncertainty
  • VerticalUncertainty
• Pset_Warranty
  • WarrantyIdentifier
  • WarrantyStartDate
  • IsExtendedWarranty
  • WarrantyPeriod
  • WarrantyContent
  • PointOfContact
  • Exclusions
• Qto_BodyGeometryValidation
  • GrossSurfaceArea
  • NetSurfaceArea
  • GrossVolume
  • NetVolume
  • SurfaceGenusBeforeFeatures
  • SurfaceGenusAfterFeatures

5.4.3.18.5 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)
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.
Aggregation	General	No description available.
Approval Association	General	No description available.
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)
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: IfcTypeObject
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.
Assignment to Group	General	No description available.
IfcProduct (18)
Body Geometry	General	The body or solid model geometric representation of an IfcProduct is typically defined using a Tessellation or Brep. Subtypes may provide recommendations on other representation types that may be used. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used: IfcShapeRepresentation.RepresentationIdentifier = 'Body' IfcShapeRepresentation.RepresentationType = Typically 'Tessellation' or 'Brep'
Product Geometric Representation	General	The geometric representation of any IfcProduct is provided by the IfcProductDefinitionShape allowing multiple geometric representations. It uses the Product Placement concept utilizing IfcLocalPlacement to establish an object coordinate system, in which all geometric representations are founded.
Product Geometry Colour	General	No description available.
Product Geometry Layer	General	No description available.
Product Relative Positioning	General	If the IfcProduct Product Placement is placed relative to an IfcPositioningElement this relationship covers the information on which IfcPositioningElement positions the IfcProduct.
Product Span Positioning	General	No description available.
Box Geometry	General	No description available.
CoG Geometry	General	No description available.
Mapped Geometry	General	No description available.
Object Typing	General	This concept can be applied to the following resources: IfcTypeProduct
Product Local Placement	General	No description available.
Product Topology Representation	General	No description available.
Property Sets for Objects	General	This concept can be applied to the following resources: Pset_Risk Pset_Tolerance Pset_Uncertainty
Quantity Sets	General	This concept can be applied to the following resources: Qto_BodyGeometryValidation
Reference Geometry	General	No description available.
Reference SweptSolid Geometry	General	No description available.
Reference SweptSolid PolyCurve Geometry	General	No description available.
Reference Tessellation Geometry	General	No description available.
Click to show 34 hidden inherited concepts Click to hide 34 inherited concepts
IfcElement (44)
Body AdvancedBrep Geometry	General	An IfcElement (so far no further constraints are defined at the level of its subtypes or by view definitions) may be represented as a single or multiple boundary representation models, which include advanced surfaces, usually referred to as NURBS surfaces. The 'AdvancedBrep' representation allows for the representation of complex free-form element shape.
Body AdvancedSwept Directrix Geometry	General	No description available.
Body AdvancedSwept DiskSolid PolyCurve Geometry	General	No description available.
Body AdvancedSwept Tapered Geometry	General	No description available.
Body Brep Geometry	General	Any IfcElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple Boundary Representation models (which are restricted to be faceted Brep's with or without voids). The Brep representation allows for the representation of complex element shape.
Body CSG Geometry	General	Any IfcElement (so far no further constraints are defined at the level of its subtypes) may be represented as a CSG primitive or CSG tree. The CSG representation allows for the representation of complex element shape.
Body SectionedSolidHorizontal	General	No description available.
Body SurfaceModel Geometry	General	Any IfcElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple surface models, based on either shell or face based surface models. It may also include tessellated models.
Body SurfaceOrSolidModel Geometry	General	Any IfcElement (so far no further constraints are defined at the level of its subtypes) may be represented as a mixed representation, including surface and solid models.
Body SweptSolid Composite Geometry	General	No description available.
Body SweptSolid CompositeCurve Geometry	General	No description available.
Body SweptSolid ParameterizedProfile Geometry	General	No description available.
Body SweptSolid PolyCurve Geometry	General	No description available.
Body Tessellation Geometry	Reference View	Any IfcElement (so far no further constraints are defined at the level of its subtypes) may be represented as a single or multiple tessellated surface models, in particular triangulated surface models.
Box Geometry	General
CoG Geometry	General	The 'CoG', Center of Gravity, shape representation is used as a means to verify the correct import by comparing the CoG of the imported geometry with the explicitly provided CoG created during export.
Element Interference	General	No description available.
Element Nesting	General	A host element can nest connected components. This should be used when there is a specific position or form factor to attach specific elements.
Element Projecting	General	No description available.
Element Voiding Features	General	No description available.
FootPrint Annotation Geometry	General	No description available.
FootPrint GeomSet PolyCurve Geometry	General	No description available.
FootPrint Geometry	General	No description available.
Mapped Geometry	General	Any IfcElement (so far no further constraints are defined at the level of its subtypes) may be represented using the 'MappedRepresentation'. This shall be supported as it allows for reusing the geometry definition of a type at all occurrences of the same type. The results are more compact data sets. The same constraints, as given for 'SurfaceOrSolidModel', 'SurfaceModel', 'Tessellation', 'Brep', and 'AdvancedBrep' geometric representation, shall apply to the IfcRepresentationMap.
Product Grid Placement	General	No description available.
Product Linear Placement	General	Product placement with a Product Linear Placement template. It defines the local coordinate system based on the curve which is referenced by IfcLinearPlacement.RelativePlacement which is an IfcAxis2PlacementLinear.Location using an IfcPointByDistanceExpression.BasisCurve. The local coordinate system is based on the tangent of the curve at Location, its normal in the global Z plane and the cross product of the aforementioned vectors.
Product Local Placement	General	The object placement for any subtype of IfcElement is defined by the IfcObjectPlacement, either IfcLocalPlacement or IfcGridPlacement, which defines the local object coordinate system that is referenced by all geometric representations of that IfcElement.
Property Sets for Objects	General	This concept can be applied to the following resources: Pset_Condition Pset_InstallationOccurrence Pset_MaintenanceStrategy Pset_MaintenanceTriggerCondition Pset_MaintenanceTriggerDuration Pset_MaintenanceTriggerPerformance Pset_RepairOccurrence Pset_ConstructionAdministration Pset_ConstructionOccurence Pset_ElementKinematics Pset_EnvironmentalCondition Pset_EnvironmentalImpactIndicators Pset_EnvironmentalImpactValues Pset_ManufacturerOccurrence Pset_ManufacturerTypeInformation Pset_ServiceLife Pset_Warranty
Surface Feature Adherence	General	No description available.
Surface Sectioned Geometry	General	No description available.
Surface Tessellation Geometry	General	No description available.
Body AdvancedSweptSolid Geometry	General	No description available.
Body Clipping Geometry	General	No description available.
Body SweptSolid Geometry	General	No description available.
Element Covering	General	No description available.
Element Occurrence Attributes	General	No description available.
Element Voiding	General	No description available.
Lighting Geometry	General	No description available.
Object Typing	General	This concept can be applied to the following resources: IfcElementType
Profile 3D Geometry	General	No description available.
Profile Geometry	General	No description available.
Spatial Containment	General	This concept can be applied to the following resources: IfcSpatialElement
Surface 3D Geometry	General	No description available.
Surface Geometry	General	No description available.

5.4.3.18.6 Formal representation

ENTITY IfcElement
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcBuiltElement
	,IfcCivilElement
	,IfcDistributionElement
	,IfcElementAssembly
	,IfcElementComponent
	,IfcFeatureElement
	,IfcFurnishingElement
	,IfcGeographicElement
	,IfcGeotechnicalElement
	,IfcTransportationDevice
	,IfcVirtualElement))
 SUBTYPE OF (IfcProduct);
	Tag : OPTIONAL IfcIdentifier;
 INVERSE
	FillsVoids : SET [0:1] OF IfcRelFillsElement FOR RelatedBuildingElement;
	ConnectedTo : SET [0:?] OF IfcRelConnectsElements FOR RelatingElement;
	IsInterferedByElements : SET [0:?] OF IfcRelInterferesElements FOR RelatedElement;
	InterferesElements : SET [0:?] OF IfcRelInterferesElements FOR RelatingElement;
	HasProjections : SET [0:?] OF IfcRelProjectsElement FOR RelatingElement;
	HasOpenings : SET [0:?] OF IfcRelVoidsElement FOR RelatingBuildingElement;
	IsConnectionRealization : SET [0:?] OF IfcRelConnectsWithRealizingElements FOR RealizingElements;
	ProvidesBoundaries : SET [0:?] OF IfcRelSpaceBoundary FOR RelatedBuildingElement;
	ConnectedFrom : SET [0:?] OF IfcRelConnectsElements FOR RelatedElement;
	ContainedInStructure : SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;
	HasCoverings : SET [0:?] OF IfcRelCoversBldgElements FOR RelatingBuildingElement;
	HasSurfaceFeatures : SET [0:?] OF IfcRelAdheresToElement FOR RelatingElement;
END_ENTITY;

5.4.3.18.7 References

• IfcBuiltElement
• IfcCivilElement
• IfcDistributionElement
• IfcElementAssembly
• IfcElementComponent
• IfcFeatureElement
• IfcFeatureElementSubtraction
• IfcFurnishingElement
• IfcGeographicElement
• IfcGeotechnicalElement
• IfcInterferenceSelect
• IfcProduct
• IfcRelAdheresToElement
• IfcRelConnectsElements
• IfcRelConnectsPorts
• IfcRelConnectsWithRealizingElements
• IfcRelCoversBldgElements
• IfcRelFillsElement
• IfcRelProjectsElement
• IfcRelSpaceBoundary
• IfcRelVoidsElement
• IfcStructuralActivityAssignmentSelect
• IfcTransportationDevice
• IfcVirtualElement