IfcStairFlight

Semantic definitions at the entity

Entity definition

A stair flight is an assembly of building components in a single "run" of stair steps (not interrupted by a landing). The stair steps and any stringers are included in the stair flight. A winder is also regarded a part of a stair flight.

An IfcStairFlight is normally aggregated by an IfcStair through the IfcRelAggregates relationship, the stair flight is then included in the set of IfcRelAggregates.RelatedObjects. An IfcStairFlight normally connects the floor slab of zero to two different storeys (or partial storeys, or landings) within a building. The connection relationship between the IfcStairFlight and the IfcSlab can be expressed using the IfcRelConnectsElements relationship.

HISTORY New entity in IFC2.0.

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
9	NumberOfRisers	IfcInteger	?	Number of the risers included in the stair flight IFC4 CHANGE The attribute has been deprecated it shall only be exposed with a NIL value. Use Pset_StairFlightCommon.NumberOfRisers instead.	X
10	NumberOfTreads	IfcInteger	?	Number of treads included in the stair flight. IFC4 CHANGE The attribute has been deprecated it shall only be exposed with a NIL value. Use Pset_StairFlightCommon.NumberOfTreads instead.	X
11	RiserHeight	IfcPositiveLengthMeasure	?	Vertical distance from tread to tread. The riser height is supposed to be equal for all stairs in a stair flight. IFC4 CHANGE The attribute has been deprecated it shall only be exposed with a NIL value. Use Pset_StairFlightCommon.RiserHeight instead.	X
12	TreadLength	IfcPositiveLengthMeasure	?	Horizontal distance from the front to the back of the tread. The tread length is supposed to be equal for all steps of the stair flight. IFC4 CHANGE The attribute has been deprecated it shall only be exposed with a NIL value. Use Pset_StairFlightCommon.TreadLength instead.	X
13	PredefinedType	IfcStairFlightTypeEnum	?	Predefined generic type for a stair flight 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 IfcStairFlightType is assigned, providing its own IfcStairFlightType.PredefinedType. IFC4 CHANGE The attribute has been added at the end of the entity definition.	X

Formal Propositions

Rule	Description
CorrectPredefinedType	Either the PredefinedType attribute is unset (e.g. because an IfcStairFlightType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED.
CorrectTypeAssigned	Either there is no stair flight type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcStairFlightType.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcRoot
1	GlobalId	IfcGloballyUniqueId		Assignment of a globally unique identifier within the entire software world.	X
2	OwnerHistory	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, NOTE only the last modification in stored - either as addition, deletion or modification. IFC4 CHANGE The attribute has been changed to be OPTIONAL.	X
3	Name	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.	X
4	Description	IfcText	?	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). IFC4 CHANGE The inverse attribute datatype has been added and separated from Decomposes defined at IfcObjectDefinition.	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). IFC4 CHANGE The inverse attribute datatype has been added and separated from IsDecomposedBy defined at IfcObjectDefinition.	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. IFC4 CHANGE The inverse attribute datatype has been added.	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). IFC4 CHANGE The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.	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). IFC4 CHANGE The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.	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	?	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. IFC4 CHANGE New inverse relationship, change made with upward compatibility for file based exchange.	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. IFC4 CHANGE New inverse relationship, change made with upward compatibility for file based exchange.	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. IFC4 CHANGE New inverse relationship, the link to IfcRelDefinesByType had previously be included in the inverse relationship IfcRelDefines. Change made with upward compatibility for file based exchange.	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. IFC4 CHANGE The data type has been changed from IfcRelDefines to IfcRelDefinesByProperties with upward compatibility for file based exchange.	X
IfcProduct
6	ObjectPlacement	IfcObjectPlacement	?	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	?	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
	PositionedRelativeTo	IfcRelPositions @RelatedProducts	S[0:1]		X
	ReferencedInStructures	IfcRelReferencedInSpatialStructure @RelatedElements	S[0:?]		X
IfcElement
8	Tag	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.	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. IFC4 CHANGE New inverse relationship.	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. IFC4 CHANGE New inverse relationship.	X
	HasProjections	IfcRelProjectsElement @RelatingElement	S[0:?]	Projection relationship that adds a feature (using a Boolean union) to the IfcBuildingElement.	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
IfcBuiltElement
IfcStairFlight
9	NumberOfRisers	IfcInteger	?	Number of the risers included in the stair flight IFC4 CHANGE The attribute has been deprecated it shall only be exposed with a NIL value. Use Pset_StairFlightCommon.NumberOfRisers instead.	X
10	NumberOfTreads	IfcInteger	?	Number of treads included in the stair flight. IFC4 CHANGE The attribute has been deprecated it shall only be exposed with a NIL value. Use Pset_StairFlightCommon.NumberOfTreads instead.	X
11	RiserHeight	IfcPositiveLengthMeasure	?	Vertical distance from tread to tread. The riser height is supposed to be equal for all stairs in a stair flight. IFC4 CHANGE The attribute has been deprecated it shall only be exposed with a NIL value. Use Pset_StairFlightCommon.RiserHeight instead.	X
12	TreadLength	IfcPositiveLengthMeasure	?	Horizontal distance from the front to the back of the tread. The tread length is supposed to be equal for all steps of the stair flight. IFC4 CHANGE The attribute has been deprecated it shall only be exposed with a NIL value. Use Pset_StairFlightCommon.TreadLength instead.	X
13	PredefinedType	IfcStairFlightTypeEnum	?	Predefined generic type for a stair flight 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 IfcStairFlightType is assigned, providing its own IfcStairFlightType.PredefinedType. IFC4 CHANGE The attribute has been added at the end of the entity definition.	X

Definitions applying to General Usage

Instance diagram

Concept usage

Object Typing

The Object Typing concept template applies to this entity as shown in Table 191.

HasType	RelatingType
	IfcStairFlightType

Table 191 — IfcStairFlight Object Typing

Property Sets for Objects

The Property Sets for Objects concept template applies to this entity as shown in Table 192.

PsetName

Properties

Pset_StairFlightCommon

Template	PropertyName	Value
Single Value	Reference	IfcIdentifier
Single Value	NumberOfRiser	IfcCountMeasure
Single Value	NumberOfTreads	IfcCountMeasure
Single Value	RiserHeight	IfcPositiveLengthMeasure
Single Value	TreadLength	IfcPositiveLengthMeasure
Single Value	NosingLength	IfcLengthMeasure
Single Value	WalkingLineOffset	IfcPositiveLengthMeasure
Single Value	TreadLengthAtOffset	IfcPositiveLengthMeasure
Single Value	TreadLengthAtInnerSide	IfcPositiveLengthMeasure
Single Value	Headroom	IfcPositiveLengthMeasure
Single Value	WaistThickness	IfcPositiveLengthMeasure
Enumerated Value	Status	IfcLabel

Pset_ConcreteElementGeneral

Template	PropertyName	Value
Single Value	ConstructionMethod	IfcLabel
Single Value	StructuralClass	IfcLabel
Single Value	StrengthClass	IfcLabel
Single Value	ExposureClass	IfcLabel
Single Value	ReinforcementVolumeRatio	IfcMassDensityMeasure
Single Value	ReinforcementAreaRatio	IfcAreaDensityMeasure
Single Value	DimensionalAccuracyClass	IfcLabel
Single Value	ConstructionToleranceClass	IfcLabel
Single Value	ConcreteCover	IfcPositiveLengthMeasure
Single Value	ConcreteCoverAtMainBars	IfcPositiveLengthMeasure
Single Value	ConcreteCoverAtLinks	IfcPositiveLengthMeasure
Single Value	ReinforcementStrengthClass	IfcLabel

Pset_PrecastConcreteElementFabrication

Template	PropertyName	Value
Single Value	TypeDesignator	IfcLabel
Single Value	ProductionLotId	IfcIdentifier
Single Value	SerialNumber	IfcIdentifier
Single Value	PieceMark	IfcLabel
Single Value	AsBuiltLocationNumber	IfcLabel
Single Value	ActualProductionDate	IfcDateTime
Single Value	ActualErectionDate	IfcDateTime

Pset_PrecastConcreteElementGeneral

Template	PropertyName	Value
Single Value	TypeDesignator	IfcLabel
Single Value	CornerChamfer	IfcPositiveLengthMeasure
Single Value	ManufacturingToleranceClass	IfcLabel
Single Value	FormStrippingStrength	IfcPressureMeasure
Single Value	LiftingStrength	IfcPressureMeasure
Single Value	ReleaseStrength	IfcPressureMeasure
Single Value	MinimumAllowableSupportLength	IfcPositiveLengthMeasure
Single Value	InitialTension	IfcPressureMeasure
Single Value	TendonRelaxation	IfcPositiveRatioMeasure
Single Value	TransportationStrength	IfcPressureMeasure
Single Value	SupportDuringTransportDescription	IfcText
Single Value	HollowCorePlugging	IfcLabel
Single Value	CamberAtMidspan	IfcRatioMeasure
Single Value	BatterAtStart	IfcPlaneAngleMeasure
Single Value	BatterAtEnd	IfcPlaneAngleMeasure
Single Value	Twisting	IfcPlaneAngleMeasure
Single Value	Shortening	IfcRatioMeasure
Single Value	PieceMark	IfcLabel
Single Value	DesignLocationNumber	IfcLabel

Table 192 — IfcStairFlight Property Sets for Objects

Quantity Sets

The Quantity Sets concept template applies to this entity as shown in Table 193.

QsetName	Quantities
Qto_StairFlightBaseQuantities

Table 193 — IfcStairFlight Quantity Sets

Material Solid

The Material Single concept applies to this entity.

The material of the IfcStairFlight is defined by the IfcMaterial and attached by the IfcRelAssociatesMaterial.RelatingMaterial. It is accessible by the inverse HasAssociations relationship.

Spatial Containment

The Spatial Containment concept template applies to this entity as shown in Table 194.

RelatingStructure	Description
IfcBuildingStorey	Default spatial container, if the stair flight is not used (by default) as a part within a stair container.
IfcBuilding	Spatial container for the element if it cannot be assigned to a building storey.
IfcSite	Spatial container for the element in case that it is placed on site (outside of building)

Table 194 — IfcStairFlight Spatial Containment

The IfcStairFlight, 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.

NOTE Model view definitions or implementer agreements may force an IfcStairFlight to be solely used as a part within an IfcStair container. In this case, no Spatial containment shall be used.

Axis 2D Geometry

The Axis 2D Geometry concept applies to this entity.

The walking line is represented by a two-dimensional open curve as the axis. The curve is directed into the upward direction (direction has to be interpreted as specified at the subtypes of IfcCurve).

Figure 248 illustrates the axis representation which has the following constraints:

In case of straight flights the curve shall be a single item of type IfcPolyline.
In case of winding flights the curve shall be a single item of type IfcCompositeCurve.
In case of a curved flight or a spiral flight the curve shall be a single item of type IfcTrimmedCurve.

Figure 248 — Stair flight axis

Footprint Geometry

The FootPrint Geometry concept template applies to this entity as shown in Table 195.

Table 195 — IfcStairFlight FootPrint Geometry

The flight foot print, including the flight boundary is represented by a two-dimensional geometric curve set.

Figure 249 illustrates the footprint representation which has the following constraints:

In case of straight flights the curve set shall consists of a single item of type IfcPolyline.
In case of winding flights or curved flights the curve set shall consists of a single item of type IfcCompositeCurve.
In case of a spiral flight the curve set shall consists of a single item of type IfcConic or IfcPolyline.

Figure 249 — Stair flight footprint

Body SweptSolid Geometry

The Body SweptSolid Geometry concept applies to this entity.

Figure 250 illustrates the 'Body' geometric representation using a 'SweptSolid' representation type.

Figure 250 — Stair flight body

mvdXML Specification


<?xml version="1.0" encoding="utf-8"?>

<ConceptRoot xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" uuid="b773e537-f2ff-4b83-ad38-5444def76d7b" name="IfcStairFlight" applicableRootEntity="IfcStairFlight">

 <Applicability>

  <Template ref="9eb75a52-8b06-4085-8bef-0bde25a8473a" />

  <TemplateRules operator="and">

  </TemplateRules>

 </Applicability>

 <Concepts>

  <Concept uuid="ad8ef14d-3bd7-447a-86f9-aeaab8e0ff37" name="Object Typing">

   <Template ref="35a2e10e-20df-40f4-ab2f-dacf0a6744f4" />

   <TemplateRules operator="and">

    <TemplateRule Parameters="RelatingType[Type]=&apos;IfcStairFlightType&apos;" />

   </TemplateRules>

  </Concept>

  <Concept uuid="d810668e-cf0a-44cd-8cbb-6d5b01f87da9" name="Property Sets for Objects">

   <Template ref="f74255a6-0c0e-4f31-84ad-24981db62461" />

   <TemplateRules operator="and">

    <TemplateRule Parameters="PsetName[Value]=&apos;Pset_StairFlightCommon&apos;" />

    <TemplateRule Parameters="PsetName[Value]=&apos;Pset_ConcreteElementGeneral&apos;" />

    <TemplateRule Parameters="PsetName[Value]=&apos;Pset_PrecastConcreteElementFabrication&apos;" />

    <TemplateRule Parameters="PsetName[Value]=&apos;Pset_PrecastConcreteElementGeneral&apos;" />

   </TemplateRules>

  </Concept>

  <Concept uuid="536329e4-81b9-4a88-b0af-c843b1269ad6" name="Quantity Sets">

   <Template ref="6652398e-6579-4460-8cb4-26295acfacc7" />

   <TemplateRules operator="and">

    <TemplateRule Parameters="QsetName[Value]=&apos;Qto_StairFlightBaseQuantities&apos;" />

   </TemplateRules>

  </Concept>

  <Concept uuid="dd1790a7-a4c0-4725-a303-a737578f85c0" name="Material Solid">

   <Template ref="5f39a814-44a0-4fb3-8dc6-ddaa0560fc54" />

  </Concept>

  <Concept uuid="42f27c5d-f2c7-4e70-b554-c50b2f035996" name="Spatial Containment">

   <Template ref="d9a3f822-0014-4bc2-8d94-9d9067759045" />

   <TemplateRules operator="and">

    <TemplateRule Description="Default spatial container, if the stair  flight is not used (by default) as a part within a stair container." Parameters="RelatingStructure[Type]=&apos;IfcBuildingStorey&apos;" />

    <TemplateRule Description="Spatial container for the element if it cannot be assigned to a building storey." Parameters="RelatingStructure[Type]=&apos;IfcBuilding&apos;" />

    <TemplateRule Description="Spatial container for the element in case that it is placed on site (outside of building)" Parameters="RelatingStructure[Type]=&apos;IfcSite&apos;" />

   </TemplateRules>

  </Concept>

  <Concept uuid="36a10ec4-1210-45d1-b032-ab0628455d03" name="Axis 2D Geometry">

   <Template ref="782444e8-d681-475a-9034-a9e7f53c6d65" />

  </Concept>

  <Concept uuid="896717fa-f1fb-4dc7-94cb-d0ba606bb3da" name="Footprint Geometry">

   <Template ref="4f5777d7-68e9-459c-aa2c-46adf3e88d31" />

  </Concept>

  <Concept uuid="13920d7d-61d9-43d1-9a0d-9666fefd9395" name="Body SweptSolid Geometry">

   <Template ref="cb7c18fa-cf83-4db1-be1b-c013ba4ed672" />

  </Concept>

 </Concepts>

</ConceptRoot>

Concept inheritance

#	Concept	Template	Model View
IfcRoot
	Identity	Software Identity	General Usage
	Revision Control	Revision Control	General Usage
IfcObjectDefinition
	Classification Association	Classification Association	General Usage
IfcObject
	Object User Identity	Object User Identity	General Usage
	Object Predefined Type	Object Predefined Type	General Usage
	Property Sets with Override	Property Sets with Override	General Usage
IfcProduct
	Product Placement	Product Placement	General Usage
	Product Geometric Representation	Product Geometric Representation	General Usage
IfcElement
	Product Local Placement	Product Local Placement	General Usage
	CoG Geometry	CoG Geometry	General Usage
	Box Geometry	Box Geometry	General Usage
	Body SurfaceOrSolidModel Geometry	Body SurfaceOrSolidModel Geometry	General Usage
	Body SurfaceModel Geometry	Body SurfaceModel Geometry	General Usage
	Body Tessellation Geometry	Body Tessellation Geometry	General Usage
	Body Brep Geometry	Body Brep Geometry	General Usage
	Body AdvancedBrep Geometry	Body AdvancedBrep Geometry	General Usage
	Body CSG Geometry	Body CSG Geometry	General Usage
	Mapped Geometry	Mapped Geometry	General Usage
	Element Voiding	Element Voiding	General Usage
	Element Projecting	Element Projecting	General Usage
	Linear Placement	Product Linear Placement	General Usage
IfcBuiltElement
	Product Assignment	Product Assignment	General Usage
	Surface 3D Geometry	Surface 3D Geometry	General Usage
IfcStairFlight
	Object Typing	Object Typing	General Usage
	Property Sets for Objects	Property Sets for Objects	General Usage
	Quantity Sets	Quantity Sets	General Usage
	Material Solid	Material Single	General Usage
	Spatial Containment	Spatial Containment	General Usage
	Axis 2D Geometry	Axis 2D Geometry	General Usage
	Footprint Geometry	FootPrint Geometry	General Usage
	Body SweptSolid Geometry	Body SweptSolid Geometry	General Usage

Item	Change	Description
IFC2x3 to IFC4 4.0.0.0
IfcStairFlight
OwnerHistory	MODIFIED	Instantiation changed to OPTIONAL.
PredefinedType	ADDED
IFC4 Addendum 1 4.0.1.0
IfcStairFlight
NumberOfRisers	MODIFIED	Name changed from NumberOfRiser to NumberOfRisers. Type changed from INTEGER to IfcInteger.
NumberOfTreads	MODIFIED	Type changed from INTEGER to IfcInteger.
IFC4 Addendum 2 Technical Corrigendum 1 4.0.2.1
IfcStairFlight
NumberOfRisers	MODIFIED	Status changed to Deprecated.
NumberOfTreads	MODIFIED	Status changed to Deprecated.
RiserHeight	MODIFIED	Status changed to Deprecated.
TreadLength	MODIFIED	Status changed to Deprecated.
IFC4x1 Final 4.1.0.0
IfcStairFlight
NumberOfRisers	MODIFIED	Status changed from Deprecated.
NumberOfTreads	MODIFIED	Status changed from Deprecated.
RiserHeight	MODIFIED	Status changed from Deprecated.
TreadLength	MODIFIED	Status changed from Deprecated.
IFC4x2 Candidate 4.2.0.0
IfcStairFlight
PositionedRelativeTo	ADDED
IFC2x3 to IFC4 4.0.0.0
IfcStairFlight
OwnerHistory	MODIFIED	Instantiation changed to OPTIONAL.
PredefinedType	ADDED
IFC4 Addendum 1 4.0.1.0
IfcStairFlight
NumberOfRisers	MODIFIED	Name changed from NumberOfRiser to NumberOfRisers. Type changed from INTEGER to IfcInteger.
NumberOfTreads	MODIFIED	Type changed from INTEGER to IfcInteger.
IFC4 Addendum 2 Technical Corrigendum 1 4.0.2.1
IfcStairFlight
NumberOfRisers	MODIFIED	Status changed to Deprecated.
NumberOfTreads	MODIFIED	Status changed to Deprecated.
RiserHeight	MODIFIED	Status changed to Deprecated.
TreadLength	MODIFIED	Status changed to Deprecated.
IFC4x1 Final 4.1.0.0
IfcStairFlight
NumberOfRisers	MODIFIED	Status changed from Deprecated.
NumberOfTreads	MODIFIED	Status changed from Deprecated.
RiserHeight	MODIFIED	Status changed from Deprecated.
TreadLength	MODIFIED	Status changed from Deprecated.
IFC4x2 Candidate 4.2.0.0
IfcStairFlight
PositionedRelativeTo	ADDED

	Treppenlauf
	Stair Flight
	Volée d'escalier

IfcStairFlight

Semantic definitions at the entity

Inherited definitions from supertypes

Definitions applying to General Usage

Formal representations