 | Treppe |
 | Stair |
 | Escalier |
| Item | SPF | XML | Change | Description | IFC2x3 to IFC4 |
|---|---|---|---|---|
| IfcStair | ||||
| OwnerHistory | MODIFIED | Instantiation changed to OPTIONAL. | ||
| PredefinedType | X | MODIFIED | Name changed from ShapeType to PredefinedType. Instantiation changed to OPTIONAL. |
A stair is a vertical passageway allowing occupants to walk (step) from one floor level to another floor level at a different elevation. It may include a landing as an intermediate floor slab.
NOTE Definition according to ISO 6707-1: Construction comprising a succession of horizontal stages (steps or landings) that make it possible to pass on foot to other levels.
The IfcStair shall either be represented:
NOTE In case of an IfcStair being the aggregate of all parts of the stair the aggregation is handled by the IfcRelAggregates relationship, relating an IfcStair with the related IfcStairFlight and landings, IfcSlab with PredefinedType=LANDING. IfcRailing's belonging to the stair may also be included into the aggregation.
NOTE Model View Definitions and implementer agreements may restrict the IfcStair being an assembly to not have an independent shape representation, but to always require that the decomposed parts have a shape representation. In this case, at least the 'Body' geometric representations shall not be provided directly at IfcStair if it is an assembly. The 'Body' geometric representation of the IfcStair is then the sum of the 'Body' shape representation of the parts within the decomposition structure.
HISTORY New entity in IFC2.0.
IFC4 CHANGE Attribute ShapeType renamed to PredefinedType.
| # | Attribute | Type | Cardinality | Description | G |
|---|---|---|---|---|---|
| 9 | PredefinedType | IfcStairTypeEnum | ? |
Predefined generic type for a stair that is specified in an enumeration. There may be a property set given specifically for the predefined types.
NOTE The PredefinedType shall only be used, if no IfcStairType is assigned, providing its own IfcStairType.PredefinedType. IFC4 CHANGE The attribute has been renamed from ShapeType and changed to be OPTIONAL with upward compatibility for file based exchange. | X |
| Rule | Description |
|---|---|
| CorrectPredefinedType | Either the PredefinedType attribute is unset (e.g. because an IfcStairType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED. |
| CorrectTypeAssigned | Either there is no stair type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcStairType. |
| # | 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 | |
| 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 | |
| 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.
IFC2x3 CHANGE The inverse attribute has been added with upward compatibility for file based exchange. | 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 | |||||
| IfcStair | |||||
| 9 | PredefinedType | IfcStairTypeEnum | ? |
Predefined generic type for a stair that is specified in an enumeration. There may be a property set given specifically for the predefined types.
NOTE The PredefinedType shall only be used, if no IfcStairType is assigned, providing its own IfcStairType.PredefinedType. IFC4 CHANGE The attribute has been renamed from ShapeType and changed to be OPTIONAL with upward compatibility for file based exchange. | X |
Object Typing
The Object Typing concept template applies to this entity as shown in Table 171.
| ||||
Table 171 — IfcStair Object Typing |
Property Sets for Objects
The Property Sets for Objects concept template applies to this entity as shown in Table 172.
Material Solid
The Material Single concept applies to this entity.
The material of the IfcStair is defined by the IfcMaterial and attached by the IfcRelAssociatesMaterial.RelatingMaterial. It is accessible by the inverse HasAssociations relationship.
Material information can also be given at the IfcStairType, defining the common attribute data for all occurrences of the same type. It is then accessible by the inverse IsDefinedBy relationship pointing to IfcStair.HasAssociations and via IfcRelAssociatesMaterial.RelatingMaterial to IfcMaterial. If both are given, then the material directly assigned to IfcStair overrides the material assigned to IfcStairType.
Spatial Containment
The Spatial Containment concept template applies to this entity as shown in Table 173.
| ||||||||
Table 173 — IfcStair Spatial Containment |
The IfcStair, as any subtype of IfcBuildingElement, may participate alternatively in one of the two different containment relationships:
Element Decomposition
The Element Decomposition concept template applies to this entity as shown in Table 174.
| ||||||||||||
Table 174 — IfcStair Element Decomposition |
Geometric representation by aggregated elements
If the IfcStair has components (referenced by SELF\IfcObject.IsDecomposedBy) with own 'Body' representation, then no 'Body' representation shall defined for the IfcStair. The IfcStair shape is then represented by the geometric representation of its components. The components are accessed via SELF\IfcObject.IsDecomposedBy[1].RelatedObjects.
Figure 251 illustrates stair placement, where the IfcStair defines the local placement for all components and the common 'Axis' representation, and each component has its own 'Body' representation.
 |
Figure 251 — Stair placement |
Placement
The Product Local Placement concept template applies to this entity as shown in Table 175.
| ||||||
Table 175 — IfcStair Product Local Placement |
The following restriction may be imposed by view definitions or implementer agreements:
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).
NOTE The 'Axis' representation of IfcStair may be provided even if the IfcStair has components with own shape representations.
Body SweptSolid Geometry
The Body SweptSolid Geometry concept applies to this entity.
Instance diagram
<?xml version="1.0"?>
<ConceptRoot xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" uuid="4a498025-8a1f-4038-a303-d541bb74d2fc" name="IfcStair" status="sample" applicableRootEntity="IfcStair">
<Applicability uuid="00000000-0000-0000-0000-000000000000" status="sample">
<Template ref="354161a7-9038-4007-bd48-b0075cb6eb2a" />
<TemplateRules operator="and" />
</Applicability>
<Concepts>
<Concept uuid="a0c46600-f44b-4f08-8a23-2132a8ac17d4" name="Object Typing" status="sample" override="false">
<Template ref="35a2e10e-20df-40f4-ab2f-dacf0a6744f4" />
<TemplateRules operator="and">
<TemplateRule Parameters="RelatingType[Type]='IfcStairType'" />
</TemplateRules>
</Concept>
<Concept uuid="9d3bc6d5-0583-4dea-b75f-f32076bc60bb" name="Property Sets for Objects" status="sample" override="false">
<Template ref="f74255a6-0c0e-4f31-84ad-24981db62461" />
<TemplateRules operator="and">
<TemplateRule Parameters="PsetName[Value]='Pset_StairCommon'" />
<TemplateRule Parameters="PsetName[Value]='Pset_ConcreteElementGeneral'" />
<TemplateRule Parameters="PsetName[Value]='Pset_PrecastConcreteElementFabrication'" />
<TemplateRule Parameters="PsetName[Value]='Pset_PrecastConcreteElementGeneral'" />
</TemplateRules>
</Concept>
<Concept uuid="0f65fd72-14e6-4ba2-a72d-fa26ba8f5d93" name="Material Solid" status="sample" override="false">
<Template ref="5f39a814-44a0-4fb3-8dc6-ddaa0560fc54" />
</Concept>
<Concept uuid="1421e6d1-c993-40eb-b159-4a1468ade509" name="Spatial Containment" status="sample" override="false">
<Template ref="d9a3f822-0014-4bc2-8d94-9d9067759045" />
<TemplateRules operator="and">
<TemplateRule Description="Default spatial container" Parameters="RelatingStructure[Type]='IfcBuildingStorey'" />
<TemplateRule Description="Spatial container for the element if it cannot be assigned to a building storey" Parameters="RelatingStructure[Type]='IfcBuilding'" />
<TemplateRule Description="Spatial container for the element in case that it is placed on site (outside of building)" Parameters="RelatingStructure[Type]='IfcSite'" />
</TemplateRules>
</Concept>
<Concept uuid="1fe0abcf-28f4-40b5-9edb-0254328b48f8" name="Element Decomposition" status="sample" override="false">
<Template ref="8a27c15a-c4ea-4ca9-8cce-7fbba1c9bce0" />
<TemplateRules operator="and">
<TemplateRule Description="Stairs may be decomposed into stair flights." Parameters="RelatedObjects[Type]='IfcStairFlight'" />
<TemplateRule Description="Stairs may be decomposed into stair landing, represented by IfcSlab.PredefinedType=LANDING" Parameters="RelatedObjects[Type]='IfcSlab'" />
<TemplateRule Description="Stairs may be decomposed into railings for zero, one, or both sides." Parameters="RelatedObjects[Type]='IfcRailing'" />
</TemplateRules>
</Concept>
<Concept uuid="93363dea-f0a0-4e4c-b841-480ea91e477b" name="Placement" status="sample" override="false">
<Template ref="cbe85b5f-7912-4a43-8bb7-1e63bf40b26d" />
</Concept>
<Concept uuid="1873b460-0c20-4f13-9529-b4ef73ee4309" name="Axis 2D Geometry" status="sample" override="false">
<Template ref="782444e8-d681-475a-9034-a9e7f53c6d65" />
</Concept>
<Concept uuid="f28febf8-dfe1-4c7d-8a8f-d23c9ebf5849" name="Body SweptSolid Geometry" status="sample" override="false">
<Template ref="cb7c18fa-cf83-4db1-be1b-c013ba4ed672" />
</Concept>
</Concepts>
</ConceptRoot>
| # | 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 | |||
| CoG Geometry | CoG Geometry | General Usage | |
| Box Geometry | Box Geometry | General Usage | |
| FootPrint Geometry | FootPrint 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 | |
| IfcBuildingElement | |||
| Product Assignment | Product Assignment | General Usage | |
| Surface 3D Geometry | Surface 3D Geometry | General Usage | |
| IfcStair | |||
| Object Typing | Object Typing | General Usage | |
| Property Sets for Objects | Property Sets for Objects | General Usage | |
| Material Solid | Material Single | General Usage | |
| Spatial Containment | Spatial Containment | General Usage | |
| Element Decomposition | Element Decomposition | General Usage | |
| Placement | Product Local Placement | General Usage | |
| Axis 2D Geometry | Axis 2D Geometry | General Usage | |
| Body SweptSolid Geometry | Body SweptSolid Geometry | General Usage | |
<xs:element name="IfcStair" type="ifc:IfcStair" substitutionGroup="ifc:IfcBuildingElement" nillable="true"/>
<xs:complexType name="IfcStair">
<xs:complexContent>
<xs:extension base="ifc:IfcBuildingElement">
<xs:attribute name="PredefinedType" type="ifc:IfcStairTypeEnum" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcStair
SUBTYPE OF (IfcBuildingElement);
PredefinedType : OPTIONAL IfcStairTypeEnum;
WHERE
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR
(PredefinedType <> IfcStairTypeEnum.USERDEFINED) OR
((PredefinedType = IfcStairTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR
('IFCSHAREDBLDGELEMENTS.IfcStairType' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));
END_ENTITY;
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