IfcWindow

Semantic definitions at the entity

Entity definition

The window is a building element that is predominately used to provide natural light and fresh air. It includes vertical opening but also horizontal opening such as skylights or light domes. It includes constructions with swinging, pivoting, sliding, or revolving panels and fixed panels. A window consists of a lining and one or several panels.

NOTE Definition according to ISO 6707-1
Construction for closing a vertical or near vertical opening in a wall or pitched roof that will admit light and may admit fresh air.

The IfcWindow defines a particular occurrence of a window inserted in the spatial context of a project. A window can:

be inserted into an IfcOpeningElement using the IfcRelFillsElement relationship, then the IfcWindow has an inverse attribute FillsVoids provided,
be part of an element assembly, often an IfcCurtainWall, using the IfcRelAggregates relationship, then the inverse attribute Decomposes is provided.
or be a "free standing" window, then the IfcWindow has no inverse attributes FillsVoids or Decomposes provided.

NOTE View definitions or implementer agreements may restrict the relationship to only include one window (or door) into one opening.

There are two entities for window occurrences:

IfcWindowStandardCase used for all occurrences of windows, that have a 'Profile' shape representation defined to which a set of shape parameters for lining and framing properties apply. Additionally it requires the provision of an IfcWindowType that references one IfcWindowLiningProperties and on to many IfcWindowPanelProperties.
IfcWindow used for all other occurrences of windows, particularly for windows having only 'Brep', or 'SurfaceModel' geometry without applying shape parameters.

The actual parameter of the window and/or its shape is defined at the IfcWindow as the occurrence definition (or project instance), or by the IfcWindowType as the specific definition (or project type). The following parameters are given:

at the IfcWindow or IfcWindowStandardCase for occurrence specific parameters. The IfcWindow specifies:
- the window width and height
- the window opening direction (by the y-axis of the ObjectPlacement)
at the IfcWindowType to which the IfcWindow is related by the inverse relationship IsDefinedBy pointing to IfcRelDefinesByType, for type parameters common to all occurrences of the same type.
- the partitioning type (single panel, double panel, tripel panel, more panels)
- the operation type (swing, tilt and turn, pivot revolve, fixed case ment, etc.)
- the window panel hinge side (by using two different styles for right and left opening windows)
- the construction material type
- the particular attributes for the lining by the IfcWindowLiningProperties
- the particular attributes for the panels by the IfcWindowPanelProperties

HISTORY New entity in IFC1.0.

IFC4 CHANGE The attributes PredefinedType and OperationType are added, the applicable type object has been changed to IfcDoorType.

Parameteric Representation using parameters at IfcWindowType

The parameters, which define the shape of the IfcWindow, are given at the IfcWindowType and the property sets, which are included in the IfcWindowType. The IfcWindow only defines the local placement. The overall size of the IfcWindow to be used to apply the lining or panel parameter provided by the IfcWindowType is determined by the IfcShapeRepresentation with the RepresentationIdentifier = 'Profile'. Only in case of an IfcWindow inserted into an IfcOpeningElement using the IfcRelFillsElement relatioship, having a horizontal extrusion (along the y-axis of the IfcDoor), the overall size is determined by the extrusion profile of the IfcOpeningElement.

Figure 256 illustrates the insertion of a window into the IfcOpeningElement by creating an instance of IfcWindow with PartitioningType = DoublePanelHorizontal. The parameters OverallHeight and OverallWidth show the extent of the window in the positive Z and X axis of the local placement of the window. The lining and the transom are created by the given parameters.

Figure 256 — Window placement

Figure 257 illustrates the final window (DoublePanelHorizontal) with first panel having PanelPosition = TOP, OperationType = BOTTOMHUNG and second panel having PanelPosition = BOTTOM and OperationType = TILTANDTURNLEFTHAND.

Figure 257 — Window planes

Window opening operation by window type

The parameters that defines the shape of the IfcWindow, are given at the IfcWindowType and the property sets, which are included in the IfcWindowType. The IfcWindow only defines the local placement which determines the opening direction of the window. The overall layout of the IfcWindow is determined by its IfcWindowType.PartitioningType. Each window panel has its own operation type, provided by IfcWindowPanelProperties.OperationType. All window panels are assumed to open into the same direction (if relevant for the particular window panel operation. The hindge side (whether a window opens to the left or to the right) is determined by the IfcWindowPanelProperties.OperationType.

NOTE There are different conventions in different countries on how to show the symbolic presentation of the window panel operation (the "triangles"). Either as seen from the exterior, or from the interior side. The following figures show the symbolics from the exterior side (the convention as used predominately in Europe).

Figure 258 illustrates window operation types.

	The window panel (for side hung windows) opens always into the direction of the positive Y axis of the local placement. The determination of whether the window opens to the left or to the right is done at IfcWindowPanelProperties.OperationType. Here it is a left side opening window given by OperationType = SideHungLeftHand.
	If the window should open to the other side, then the local placement has to be changed. It is still a left hung window, given by IfcWindowPanelProperties.OperationType = SideHungLeftHand.
	If the window panel (for side hung windows) opens to the right, a separate window panel style needs to be used (here IfcWindowPanelProperties.OperationType = SideHungRightHand) and it always opens into the direction of the positive Y axis of the local placement.
	If the window should open to the other side, then the local placement has to be changed. It is still a right hung window, given by IfcWindowPanelProperties.OperationType = SideHungRightHand. .

Figure 258 — Window operations

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
9	OverallHeight	IfcPositiveLengthMeasure	[0:1]	Overall measure of the height, it reflects the Z Dimension of a bounding box, enclosing the window opening. If omitted, the OverallHeight should be taken from the geometric representation of the IfcOpening in which the window is inserted. NOTE The body of the window might be taller then the window opening (for example in cases where the window lining includes a casing). In these cases the OverallHeight shall still be given as the window opening height, and not as the total height of the window lining.	X
10	OverallWidth	IfcPositiveLengthMeasure	[0:1]	Overall measure of the width, it reflects the X Dimension of a bounding box, enclosing the window opening. If omitted, the OverallWidth should be taken from the geometric representation of the IfcOpening in which the window is inserted. NOTE The body of the window might be wider then the window opening (for example in cases where the window lining includes a casing). In these cases the OverallWidth shall still be given as the window opening width, and not as the total width of the window lining.	X
11	PredefinedType	IfcWindowTypeEnum	[0:1]	Predefined generic type for a window that is specified in an enumeration. There may be a property set given specificly for the predefined types. NOTE The PredefinedType shall only be used, if no IfcWindowType is assigned, providing its own IfcWindowType.PredefinedType.	X
12	PartitioningType	IfcWindowTypePartitioningEnum	[0:1]	Type defining the general layout of the window in terms of the partitioning of panels. NOTE The PartitioningType shall only be used, if no type object IfcWindowType is assigned, providing its own IfcWindowType.PartitioningType.	X
13	UserDefinedPartitioningType	IfcLabel	[0:1]	Designator for the user defined partitioning type, shall only be provided, if the value of PartitioningType is set to USERDEFINED.	X

Formal Propositions

Rule	Description
CorrectStyleAssigned	Either there is no door type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcWindowStyle. NOTEnbsp; The deprecated type IfcWindowStyle is still included for backward compatibility reasons.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcRoot
1	GlobalId	IfcGloballyUniqueId	[1:1]	Assignment of a globally unique identifier within the entire software world.	X
2	OwnerHistory	IfcOwnerHistory	[0:1]	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, NOTE only the last modification in stored - either as addition, deletion or modification.	X
3	Name	IfcLabel	[0:1]	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.	X
4	Description	IfcText	[0:1]	Optional description, provided for exchanging informative comments.	X
IfcObjectDefinition
	HasAssignments	IfcRelAssigns @RelatedObjects	S[0:?]	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.	X
	Nests	IfcRelNests @RelatedObjects	S[0:1]	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).	X
	IsNestedBy	IfcRelNests @RelatingObject	S[0:?]	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).	X
	HasContext	IfcRelDeclares @RelatedDefinitions	S[0:1]	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.	X
	IsDecomposedBy	IfcRelAggregates @RelatingObject	S[0:?]	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).	X
	Decomposes	IfcRelAggregates @RelatedObjects	S[0:1]	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).	X
	HasAssociations	IfcRelAssociates @RelatedObjects	S[0:?]	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.	X
IfcObject
5	ObjectType	IfcLabel	[0:1]	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.	X
	IsDeclaredBy	IfcRelDefinesByObject @RelatedObjects	S[0:1]	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.	X
	Declares	IfcRelDefinesByObject @RelatingObject	S[0:?]	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.	X
	IsTypedBy	IfcRelDefinesByType @RelatedObjects	S[0:1]	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.	X
	IsDefinedBy	IfcRelDefinesByProperties @RelatedObjects	S[0:?]	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.	X
IfcProduct
6	ObjectPlacement	IfcObjectPlacement	[0:1]	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 constraint (e.g. relative to grid axes). It is determined by the various subtypes of IfcObjectPlacement, which includes the axis placement information to determine the transformation for the object coordinate system.	X
7	Representation	IfcProductRepresentation	[0:1]	Reference to the representations of the product, being either a representation (IfcProductRepresentation) or as a special case a shape representations (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.	X
	ReferencedBy	IfcRelAssignsToProduct @RelatingProduct	S[0:?]	Reference to the IfcRelAssignsToProduct relationship, by which other products, processes, controls, resources or actors (as subtypes of IfcObjectDefinition) can be related to this product.	X
IfcElement
8	Tag	IfcIdentifier	[0:1]	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.	X
	FillsVoids	IfcRelFillsElement @RelatedBuildingElement	S[0:1]	Reference to the IfcRelFillsElement Relationship that puts the element as a filling into the opening created within another element.	X
	ConnectedTo	IfcRelConnectsElements @RelatingElement	S[0:?]	Reference to the element connection relationship. The relationship then refers to the other element to which this element is connected to.	X
	IsInterferedByElements	IfcRelInterferesElements @RelatedElement	S[0:?]	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. NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements.	X
	InterferesElements	IfcRelInterferesElements @RelatingElement	S[0:?]	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. NOTE There is no indication of precedence between IsInterferedByElements and InterferesElements.	X
	HasProjections	IfcRelProjectsElement @RelatingElement	S[0:?]	Projection relationship that adds a feature (using a Boolean union) to the IfcBuildingElement.	X
	ReferencedInStructures	IfcRelReferencedInSpatialStructure @RelatedElements	S[0:?]	Reference relationship to the spatial structure element, to which the element is additionally associated. This relationship may not be hierarchical, an element may be referenced by zero, one or many spatial structure elements.	X
	HasOpenings	IfcRelVoidsElement @RelatingBuildingElement	S[0:?]	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.	X
	IsConnectionRealization	IfcRelConnectsWithRealizingElements @RealizingElements	S[0:?]	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.	X
	ProvidesBoundaries	IfcRelSpaceBoundary @RelatedBuildingElement	S[0:?]	Reference to space boundaries by virtue of the objectified relationship IfcRelSpaceBoundary. It defines the concept of an element bounding spaces.	X
	ConnectedFrom	IfcRelConnectsElements @RelatedElement	S[0:?]	Reference to the element connection relationship. The relationship then refers to the other element that is connected to this element.	X
	ContainedInStructure	IfcRelContainedInSpatialStructure @RelatedElements	S[0:1]	Containment relationship to the spatial structure element, to which the element is primarily associated. This containment relationship has to be hierachical, i.e. an element may only be assigned directly to zero or one spatial structure.	X
	HasCoverings	IfcRelCoversBldgElements @RelatingBuildingElement	S[0:?]	Reference to IfcCovering by virtue of the objectified relationship IfcRelCoversBldgElement. It defines the concept of an element having coverings associated.	X
IfcBuildingElement
IfcWindow
9	OverallHeight	IfcPositiveLengthMeasure	[0:1]	Overall measure of the height, it reflects the Z Dimension of a bounding box, enclosing the window opening. If omitted, the OverallHeight should be taken from the geometric representation of the IfcOpening in which the window is inserted. NOTE The body of the window might be taller then the window opening (for example in cases where the window lining includes a casing). In these cases the OverallHeight shall still be given as the window opening height, and not as the total height of the window lining.	X
10	OverallWidth	IfcPositiveLengthMeasure	[0:1]	Overall measure of the width, it reflects the X Dimension of a bounding box, enclosing the window opening. If omitted, the OverallWidth should be taken from the geometric representation of the IfcOpening in which the window is inserted. NOTE The body of the window might be wider then the window opening (for example in cases where the window lining includes a casing). In these cases the OverallWidth shall still be given as the window opening width, and not as the total width of the window lining.	X
11	PredefinedType	IfcWindowTypeEnum	[0:1]	Predefined generic type for a window that is specified in an enumeration. There may be a property set given specificly for the predefined types. NOTE The PredefinedType shall only be used, if no IfcWindowType is assigned, providing its own IfcWindowType.PredefinedType.	X
12	PartitioningType	IfcWindowTypePartitioningEnum	[0:1]	Type defining the general layout of the window in terms of the partitioning of panels. NOTE The PartitioningType shall only be used, if no type object IfcWindowType is assigned, providing its own IfcWindowType.PartitioningType.	X
13	UserDefinedPartitioningType	IfcLabel	[0:1]	Designator for the user defined partitioning type, shall only be provided, if the value of PartitioningType is set to USERDEFINED.	X

Definitions applying to Common Use Definitions

Instance diagram

Concept usage

Object Typing

The Object Typing concept applies to this entity as shown in Table 194.

Type
IfcWindowType

Table 194 — IfcWindow Object Typing

Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 195.

PredefinedType

Name

Properties

Pset_WindowCommon

Single Value

Name	Value
Reference	IfcIdentifier
AcousticRating	IfcLabel
FireRating	IfcLabel
SecurityRating	IfcLabel
IsExternal	IfcBoolean
Infiltration	IfcVolumetricFlowRateMeasure
ThermalTransmittance	IfcThermalTransmittanceMeasure
GlazingAreaFraction	IfcPositiveRatioMeasure
HasSillExternal	IfcBoolean
HasSillInternal	IfcBoolean
HasDrive	IfcBoolean
SmokeStop	IfcBoolean
FireExit	IfcBoolean
WaterTightnessRating	IfcLabel
MechanicalLoadRating	IfcLabel
WindLoadRating	IfcLabel

Enumerated Value

Name	Value	Value
Status	IfcLabel	IfcLabel

Pset_EnvironmentalImpactIndicators

Single Value

Name	Value
Reference	IfcIdentifier
FunctionalUnitReference	IfcLabel
Unit	IfcText
ExpectedServiceLife	IfcTimeMeasure
TotalPrimaryEnergyConsumptionPerUnit	IfcEnergyMeasure
WaterConsumptionPerUnit	IfcVolumeMeasure
HazardousWastePerUnit	IfcMassMeasure
NonHazardousWastePerUnit	IfcMassMeasure
ClimateChangePerUnit	IfcMassMeasure
AtmosphericAcidificationPerUnit	IfcMassMeasure
RenewableEnergyConsumptionPerUnit	IfcEnergyMeasure
NonRenewableEnergyConsumptionPerUnit	IfcEnergyMeasure
ResourceDepletionPerUnit	IfcMassMeasure
InertWastePerUnit	IfcMassMeasure
RadioactiveWastePerUnit	IfcMassMeasure
StratosphericOzoneLayerDestructionPerUnit	IfcMassMeasure
PhotochemicalOzoneFormationPerUnit	IfcMassMeasure
EutrophicationPerUnit	IfcMassMeasure

Enumerated Value

Name	Value	Value
LifeCyclePhase	IfcLabel	IfcLabel

Pset_EnvironmentalImpactValues

Single Value

Name	Value
TotalPrimaryEnergyConsumption	IfcEnergyMeasure
WaterConsumption	IfcVolumeMeasure
HazardousWaste	IfcMassMeasure
NonHazardousWaste	IfcMassMeasure
ClimateChange	IfcMassMeasure
AtmosphericAcidification	IfcMassMeasure
RenewableEnergyConsumption	IfcEnergyMeasure
NonRenewableEnergyConsumption	IfcEnergyMeasure
ResourceDepletion	IfcMassMeasure
InertWaste	IfcMassMeasure
RadioactiveWaste	IfcMassMeasure
StratosphericOzoneLayerDestruction	IfcMassMeasure
PhotochemicalOzoneFormation	IfcMassMeasure
Eutrophication	IfcMassMeasure
LeadInTime	IfcDuration
Duration	IfcDuration
LeadOutTime

Pset_Condition

Single Value

Name	Value
AssessmentDate	IfcDate
AssessmentCondition	IfcLabel
AssessmentDescription	IfcText

Pset_ManufacturerOccurrence

Single Value

Name	Value
AcquisitionDate	IfcDate
BarCode	IfcIdentifier
SerialNumber	IfcIdentifier
BatchReference	IfcIdentifier

Enumerated Value

Name	Value	Value
AssemblyPlace	IfcLabel	IfcLabel

Pset_ManufacturerTypeInformation

Single Value

Name	Value
GlobalTradeItemNumber	IfcIdentifier
ArticleNumber	IfcIdentifier
ModelReference	IfcLabel
ModelLabel	IfcLabel
Manufacturer	IfcLabel
ProductionYear	IfcLabel

Enumerated Value

Name	Value	Value
AssemblyPlace	IfcLabel	IfcLabel

Pset_ServiceLife

Single Value

Name	Value
MeanTimeBetweenFailure	IfcDuration

Bounded Value

Name	Value	Value
ServiceLifeDuration	IfcDuration	IfcDuration

Pset_Warranty

Single Value

Name	Value
WarrantyIdentifier	IfcIdentifier
WarrantyStartDate	IfcDate
WarrantyEndDate	IfcDate
IsExtendedWarranty	IfcBoolean
WarrantyPeriod	IfcTimeMeasure
WarrantyContent	IfcText
Exclusions	IfcText

Table 195 — IfcWindow Property Sets for Objects

Quantity Sets

The Quantity Sets concept applies to this entity as shown in Table 196.

Name
Qto_WindowBaseQuantities

Table 196 — IfcWindow Quantity Sets

Material Constituents

The Material Constituents concept applies to this entity as shown in Table 197.

Name	Description
Lining	Indicates that the material constituent applies to the window lining.
Framing	Indicates that the material constituent applies to the windows panels(s); if not provided, the 'Lining' material information applies to panel(s) as well.
Glazing	Indicates that the material constituent applies to the glazing part.

Table 197 — IfcWindow Material Constituents

The material of the IfcWindow is defined by the IfcMaterialConstituentSet or as fall back by IfcMaterial and attached by the IfcRelAssociatesMaterial.RelatingMaterial. It is accessible by the inverse HasAssociations relationship.

If the fall back single IfcMaterial is referenced, it applies to the lining and framing of the window.

Spatial Containment

The Spatial Containment concept applies to this entity as shown in Table 198.

Structure
IfcBuildingStorey
IfcBuilding
IfcSite

Table 198 — IfcWindow Spatial Containment

The IfcWindow, as any subtype of IfcBuildingElement, may participate alternatively in one of the two different containment relationships:

the Spatial Containment (defined here), or
the Element Composition.

The IfcWindow may also be connected to the IfcOpeningElement in which it is placed as a filler. In this case, the spatial containment relationship shall be provided, see Figure 257.

	NOTE The containment shall be defined independently of the filling relationship, that is, even if the IfcWindow is a filling of an opening established by IfcRelFillsElement, it is also contained in the spatial structure by an IfcRelContainedInSpatialStructure.
Figure 257 — Window spatial containment

Product Local Placement

The Product Local Placement concept applies to this entity as shown in Table 199.

Type	Relative	Description
IfcLocalPlacement	IfcLocalPlacement	Relative placement according to position and rotation relative to container.
IfcLocalPlacement		Absolute placement according to position and rotation of world coordinate system.
IfcGridPlacement		Placement according to grid intersection.

Table 199 — IfcWindow Product Local Placement

The following restriction is imposed:

The PlacementRelTo relationship of IfcLocalPlacement shall point to the local placement of the same element (if given), in which the IfcWindow is used as a filling (normally an IfcOpeningElement), as provided by the IfcRelFillsElement relationship.
If the IfcWindow is not inserted into an IfcOpeningElement, then the PlacementRelTo relationship of IfcLocalPlacement shall point (if given) to the local placement of the same IfcSpatialStructureElement that is used in the ContainedInStructure inverse attribute or to a referenced spatial structure element at a higher level.
If the relative placement is not used, the absolute placement is defined within the world coordinate system.

NOTE The product placement is used to determine the opening direction of the window.

Profile Geometry

The Profile Geometry concept applies to this entity as shown in Table 200.

Identifier	Type	Items

Table 200 — IfcWindow Profile Geometry

The window profile is represented by a three-dimensional closed curve within a particular shape representation. The profile is used to apply the parameter of the parametric window representation. The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used:

RepresentationIdentifier : 'Profile'
RepresentationType : 'Curve3D', only a single closed curve shall be contained in the set of IfcShapeRepresentation.Items.

A 'Profile' representation has to be provided if:

a parametric representation shall be applied to the window AND
- the window is 'free standing', or
- the opening into which the window is inserted is not extruded horizontally (i.e. where the opening profile does not match the window profile)

Profile 3D Geometry

The Profile 3D Geometry concept applies to this entity.

Concept inheritance

#	Concept	Model View
IfcRoot
	Software Identity	Common Use Definitions
	Revision Control	Common Use Definitions
IfcObject
	Object Occurrence Predefined Type	Common Use Definitions
IfcElement
	Box Geometry	Common Use Definitions
	FootPrint Geometry	Common Use Definitions
	Body SurfaceOrSolidModel Geometry	Common Use Definitions
	Body SurfaceModel Geometry	Common Use Definitions
	Body Tessellation Geometry	Common Use Definitions
	Body Brep Geometry	Common Use Definitions
	Body AdvancedBrep Geometry	Common Use Definitions
	Body CSG Geometry	Common Use Definitions
	Mapped Geometry	Common Use Definitions
	Mesh Geometry	Common Use Definitions
IfcBuildingElement
	Product Assignment	Common Use Definitions
	Surface 3D Geometry	Common Use Definitions
IfcWindow
	Object Typing	Common Use Definitions
	Property Sets for Objects	Common Use Definitions
	Quantity Sets	Common Use Definitions
	Material Constituents	Common Use Definitions
	Spatial Containment	Common Use Definitions
	Product Local Placement	Common Use Definitions
	Profile Geometry	Common Use Definitions
	Profile 3D Geometry	Common Use Definitions

Examples

Wall with opening and window

Formal representations

XSD Specification

 <xs:element name="IfcWindow" type="ifc:IfcWindow" substitutionGroup="ifc:IfcBuildingElement" nillable="true"/>

 <xs:complexType name="IfcWindow">

  <xs:complexContent>

   <xs:extension base="ifc:IfcBuildingElement">

    <xs:attribute name="OverallHeight" type="ifc:IfcPositiveLengthMeasure" use="optional"/>

    <xs:attribute name="OverallWidth" type="ifc:IfcPositiveLengthMeasure" use="optional"/>

    <xs:attribute name="PredefinedType" type="ifc:IfcWindowTypeEnum" use="optional"/>

    <xs:attribute name="PartitioningType" type="ifc:IfcWindowTypePartitioningEnum" use="optional"/>

    <xs:attribute name="UserDefinedPartitioningType" type="ifc:IfcLabel" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcWindow

 SUPERTYPE OF(IfcWindowStandardCase)

 SUBTYPE OF (IfcBuildingElement);

  OverallHeight : OPTIONAL IfcPositiveLengthMeasure;

  OverallWidth : OPTIONAL IfcPositiveLengthMeasure;

  PredefinedType : OPTIONAL IfcWindowTypeEnum;

  PartitioningType : OPTIONAL IfcWindowTypePartitioningEnum;

  UserDefinedPartitioningType : OPTIONAL IfcLabel;

 WHERE

  CorrectStyleAssigned : (SIZEOF(IsTypedBy) = 0) 
OR ('IFCSHAREDBLDGELEMENTS.IFCWINDOWTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));
END_ENTITY;

 EXPRESS-G diagram

Link to this page

Item	Change	Description
IFC2x3 to IFC4
IfcWindow
OwnerHistory	MODIFIED	Instantiation changed to OPTIONAL.
PredefinedType	ADDED
PartitioningType	ADDED
UserDefinedPartitioningType	ADDED

	Fenster
	Window
	Fenêtre