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The building element type IfcStairFlightType defines commonly shared information for occurrences of stair flights. The set of shared information may include:

It is used to define a stair flight type specification indicating the specific product information that is common to all occurrences of that product type. The IfcStairFlightType may be declared within IfcProject or IfcProjectLibrary using IfcRelDeclares and may be exchanged with or without occurrences of the type. Occurrences of IfcStairFlightType are represented by instances of IfcStairFlight. Refer to the documentation at IfcStairFlight for supported property sets, materials, and composition.

HISTORY  New entity in IFC2x2.

Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

Type Body Geometry

The Type Body Geometry concept applies to this entity.

XSD Specification:

 <xs:element name="IfcStairFlightType" type="ifc:IfcStairFlightType" substitutionGroup="ifc:IfcBuildingElementType" nillable="true"/>
 <xs:complexType name="IfcStairFlightType">
   <xs:extension base="ifc:IfcBuildingElementType">
    <xs:attribute name="PredefinedType" type="ifc:IfcStairFlightTypeEnum" use="optional"/>

EXPRESS Specification:

ENTITY IfcStairFlightType
SUBTYPE OF IfcBuildingElementType;
PredefinedType : IfcStairFlightTypeEnum;
CorrectPredefinedType : (PredefinedType <> IfcStairFlightTypeEnum.USERDEFINED) OR ((PredefinedType = IfcStairFlightTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcElementType.ElementType));

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

PredefinedType : Identifies the predefined types of a stair flight element from which the type required may be set.

Formal Propositions:

CorrectPredefinedType : The inherited attribute ElementType shall be provided, if the PredefinedType is set to USERDEFINED.

Inheritance Graph:

ENTITY IfcStairFlightType
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
HasAssignments : SET OF IfcRelAssigns FOR RelatedObjects;
Nests : SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy : SET OF IfcRelNests FOR RelatingObject;
HasContext : SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy : SET OF IfcRelAggregates FOR RelatingObject;
Decomposes : SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations : SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcTypeObject
ApplicableOccurrence : OPTIONAL IfcIdentifier;
HasPropertySets : OPTIONAL SET [1:?] OF IfcPropertySetDefinition;
Types : SET [0:1] OF IfcRelDefinesByType FOR RelatingType;
ENTITY IfcTypeProduct
RepresentationMaps : OPTIONAL LIST [1:?] OF UNIQUE IfcRepresentationMap;
Tag : OPTIONAL IfcLabel;
ReferencedBy : SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcElementType
ElementType : OPTIONAL IfcLabel;
ENTITY IfcBuildingElementType
ENTITY IfcStairFlightType
PredefinedType : IfcStairFlightTypeEnum;

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