5.4.3.68 IfcSpatialStructureElement
ABSTRACT This definition may not be instantiated
5.4.3.68.1 Semantic definition
A spatial structure element is the generalization of all spatial elements that might be used to define a spatial structure. The spatial structure can be used to provide a spatial organization of a project.
A spatial project structure might define as many levels of decomposition as necessary for the project. Elements within the spatial project structure are:
- site as IfcSite
- facility as IfcFacility, or specifically
- building as IfcBuilding
- bridge as IfcBridge
- marine facility as IfcMarineFacility
- railway as IfcRailway
-
road as IfcRoad
-
facility part as IfcFacilityPart, or specifically
- storey as IfcBuildingStorey
-
facility part as IfcFacilityPart
-
space as IfcSpace
or aggregations or parts thereof. The composition type declares an element to be either an element itself, or an aggregation (complex) or a decomposition (part). The interpretation of these types is given at each subtype of IfcSpatialStructureElement.
The IfcRelAggregates is defined as an 1-to-many relationship and used to establish the relationship between exactly two levels within the spatial project structure. Finally the highest level of the spatial structure is assigned to IfcProject using the IfcRelAggregates.
The subtypes of IfcSpatialStructureElement relate to other elements and systems by establishing the following relationships:
- Containment of elements : IfcRelContainedInSpatialStructure by inverse attribute ContainsElements, used to assign any element, like building elements, MEP elements, etc. to the spatial structure element in which they are primarily contained.
- Reference of elements : IfcRelReferencedInSpatialStructure by inverse attribute ReferencesElements, used to reference any element, like building elements, MEP elements, etc. in spatial structure elements, other then the one, where it is contained. Since the deprecation of IfcRelServicesBuildings, IfcRelReferencedInSpatialStructure is also used to reference a system, like a building service or electrical distribution system, a zonal system, or a structural analysis system, that is assigned to this spatial structure element.
The subtypes of IfcSpatialStructureElement relate to each other by using the IfcRelAggregates relationship to build the project spatial structure. Figure 5.4.3.68.A shows the use of IfcRelAggregates to establish a spatial structure including site, building, building section and storey. More information is provided at the level of the subtypes.
Informal Propositions
- The spatial project structure, established by the IfcRelAggregates, shall be acyclic.
- A site should not be (directly or indirectly) associated to a building, storey or space.
- A building should not be (directly or indirectly) associated to a storey or space.
- A storey should not be (directly or indirectly) associated to a space.
5.4.3.68.2 Entity inheritance
5.4.3.68.3 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. |
|
| IfcSpatialElement (6) | |||
| 8 | LongName | OPTIONAL IfcLabel |
Long name for a spatial structure element, used for informal purposes. It should be used, if available, in conjunction with the inherited Name attribute. |
| ContainsElements | SET [0:?] OF IfcRelContainedInSpatialStructure FOR RelatingStructure |
Set of spatial containment relationships, that holds those elements, which are contained within this element of the project spatial structure. |
|
| ServicedBySystems | SET [0:?] OF IfcRelServicesBuildings FOR RelatedBuildings |
Set of relationships to systems, that provides a certain service to the spatial element for which it is defined. The relationship is handled by the objectified relationship IfcRelServicesBuildings. |
|
| ReferencesElements | SET [0:?] OF IfcRelReferencedInSpatialStructure FOR RelatingStructure |
Set of spatial reference relationships, that holds those elements, which are referenced, but not contained, within this element of the project spatial structure. |
|
| IsInterferedByElements | SET [0:?] OF IfcRelInterferesElements FOR RelatedElement |
Reference to the interference relationship to indicate the spatial element that is interfered. The relationship, if provided, indicates that this spatial element has an interference with one or many other spatial elements. |
|
| InterferesElements | SET [0:?] OF IfcRelInterferesElements FOR RelatingElement |
Reference to the interference relationship to indicate the spatial element that interferes. The relationship, if provided, indicates that this spatial element has an interference with one or many other spatial elements. |
|
| Click to show 27 hidden inherited attributes Click to hide 27 inherited attributes | |||
| IfcSpatialStructureElement (1) | |||
| 9 | CompositionType | OPTIONAL IfcElementCompositionEnum |
Denotes, whether the predefined spatial structure element represents itself, or an aggregate (complex) or a part (part). The interpretation is given separately for each subtype of spatial structure element. If no CompositionType is asserted, the default value ''ELEMENT'' applies. |
5.4.3.68.4 Formal propositions
| Name | Description |
|---|---|
| WR41 |
All spatial structure elements shall be associated (using the IfcRelAggregates relationship) with another spatial structure element, or with IfcProject. |
|
|
5.4.3.68.5 Property sets
-
Pset_AirSideSystemInformation
- Description
- AirSideSystemType
- AirSideSystemDistributionType
- TotalAirFlow
- EnergyGainTotal
- AirFlowSensible
- EnergyGainSensible
- EnergyLoss
- InfiltrationDiversitySummer
- InfiltrationDiversityWinter
- ApplianceDiversity
- HeatingTemperatureDelta
- CoolingTemperatureDelta
- Ventilation
- FanPower
-
Pset_PropertyAgreement
- AgreementType
- TrackingIdentifier
- AgreementVersion
- AgreementDate
- PropertyName
- CommencementDate
- TerminationDate
- Duration
- Options
- ConditionCommencement
- Restrictions
- ConditionTermination
-
Pset_Risk
- RiskName
- RiskType
- NatureOfRisk
- RiskAssessmentMethodology
- UnmitigatedRiskLikelihood
- UnmitigatedRiskConsequence
- UnmitigatedRiskSignificance
- MitigationPlanned
- MitigatedRiskLikelihood
- MitigatedRiskConsequence
- MitigatedRiskSignificance
- MitigationProposed
- AssociatedProduct
- AssociatedActivity
- AssociatedLocation
-
Pset_SpaceAirHandlingDimensioning
- CoolingDesignAirFlow
- HeatingDesignAirFlow
- SensibleHeatGain
- TotalHeatGain
- TotalHeatLoss
- CoolingDryBulb
- CoolingRelativeHumidity
- HeatingDryBulb
- HeatingRelativeHumidity
- VentilationDesignAirFlow
- DesignAirFlow
- CeilingRAPlenum
- BoundaryAreaHeatLoss
-
Pset_SpaceCommon
- Reference
- IsExternal
- GrossPlannedArea
- NetPlannedArea
- PubliclyAccessible
- HandicapAccessible
-
Pset_SpaceCoveringRequirements
- FloorCovering
- FloorCoveringThickness
- WallCovering
- WallCoveringThickness
- CeilingCovering
- CeilingCoveringThickness
- SkirtingBoard
- SkirtingBoardHeight
- Molding
- MoldingHeight
- ConcealedFlooring
- ConcealedFlooringOffset
- ConcealedCeiling
- ConcealedCeilingOffset
-
Pset_SpaceFireSafetyRequirements
- FireRiskFactor
- FlammableStorage
- FireExit
- SprinklerProtection
- SprinklerProtectionAutomatic
- AirPressurization
-
Pset_SpaceHVACDesign
- TemperatureSetPoint
- TemperatureMax
- TemperatureMin
- TemperatureSummerMax
- TemperatureSummerMin
- TemperatureWinterMax
- TemperatureWinterMin
- HumiditySetPoint
- HumidityMax
- HumidityMin
- HumiditySummer
- HumidityWinter
- DiscontinuedHeating
- NaturalVentilation
- NaturalVentilationRate
- MechanicalVentilation
- MechanicalVentilationRate
- AirConditioning
- AirConditioningCentral
- AirHandlingName
-
Pset_SpaceLightingDesign
- ArtificialLighting
- Illuminance
-
Pset_SpaceOccupancyRequirements
- OccupancyType
- OccupancyNumber
- OccupancyNumberPeak
- OccupancyTimePerDay
- AreaPerOccupant
- MinimumHeadroom
- IsOutlookDesirable
-
Pset_SpaceThermalLoad
- People
- Lighting
- EquipmentSensible
- VentilationIndoorAir
- VentilationOutdoorAir
- RecirculatedAir
- ExhaustAir
- AirExchangeRate
- DryBulbTemperature
- RelativeHumidity
- InfiltrationSensible
- TotalSensibleLoad
- TotalLatentLoad
- TotalRadiantLoad
-
Pset_SpaceThermalLoadPHistory
- PeopleHistory
- LightingHistory
- EquipmentSensibleHistory
- VentilationIndoorAirHistory
- VentilationOutdoorAirHistory
- RecirculatedAirHistory
- ExhaustAirHistory
- AirExchangeRateTimeHistory
- DryBulbTemperatureHistory
- RelativeHumidityHistory
- InfiltrationSensibleHistory
- TotalSensibleLoadHistory
- TotalLatentLoadHistory
- TotalRadiantLoadHistory
-
Pset_SpaceThermalPHistory
- CoolingAirFlowRate
- HeatingAirFlowRate
- VentilationAirFlowRateHistory
- ExhaustAirFlowRate
- SpaceTemperatureHistory
- SpaceRelativeHumidity
-
Pset_ThermalLoad
- OccupancyDiversity
- LightingDiversity
- ApplianceDiversity
- OutsideAirPerPerson
- ReceptacleLoadIntensity
- AppliancePercentLoadToRadiant
- LightingLoadIntensity
- LightingPercentLoadToReturnAir
- TotalCoolingLoad
- TotalHeatingLoad
- InfiltrationDiversitySummer
- InfiltrationDiversityWinter
- LoadSafetyFactor
-
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
-
Qto_BodyGeometryValidation
- GrossSurfaceArea
- NetSurfaceArea
- GrossVolume
- NetVolume
- SurfaceGenusBeforeFeatures
- SurfaceGenusAfterFeatures
5.4.3.68.6 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: |
|
| 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:
|
|
| 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: |
|
| 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: |
|
| Quantity Sets | General |
This concept can be applied to the following resources: |
|
| 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. |
|
| IfcSpatialElement (11) | |||
| Body Geometry | General |
A spatial element will not usually provide a body geometry, instead relying on its constituting elements. A body geometry may be provided if it is necessary to expose an independent geometric representation. This geometry is typically expressed by its exterior elements or volume boundary. |
|
| FootPrint GeomSet Geometry | General |
No description available. |
|
| Group Spatial Connectivity | General |
No description available. |
|
| Property Sets for Objects | General |
This concept can be applied to the following resources: |
|
| Spatial Interference | General |
No description available. |
|
| Spatial Interference With Zones | General |
No description available. |
|
| Object Typing | General |
This concept can be applied to the following resources: |
|
| Property Sets for Performance | General |
This concept can be applied to the following resources: |
|
| Spatial Container | General |
This concept can be applied to the following resources: |
|
| Spatial Element Attributes | General |
No description available. |
|
| Spatial Service Connectivity | General |
No description available. |
|
| Click to show 45 hidden inherited concepts Click to hide 45 inherited concepts | |||
| IfcSpatialStructureElement (2) | |||
| Property Sets for Objects | General |
This concept can be applied to the following resources: |
|
| Object Typing | General |
This concept can be applied to the following resources: |
|
5.4.3.68.7 Formal representation
ENTITY IfcSpatialStructureElement
ABSTRACT SUPERTYPE OF (ONEOF
(IfcBuildingStorey
,IfcFacility
,IfcFacilityPart
,IfcSite
,IfcSpace))
SUBTYPE OF (IfcSpatialElement);
CompositionType : OPTIONAL IfcElementCompositionEnum;
WHERE
WR41 : (HIINDEX(SELF\IfcObjectDefinition.Decomposes) = 1)
AND
('IFC4X3_DEV_c85b862.IFCRELAGGREGATES' IN TYPEOF(SELF\IfcObjectDefinition.Decomposes[1]))
AND
(('IFC4X3_DEV_c85b862.IFCPROJECT' IN TYPEOF (SELF\IfcObjectDefinition.Decomposes[1].RelatingObject)) OR
('IFC4X3_DEV_c85b862.IFCSPATIALSTRUCTUREELEMENT' IN TYPEOF (SELF\IfcObjectDefinition.Decomposes[1].RelatingObject))
);
END_ENTITY;