5.4.3.4 IfcBuildingElementType

Type d'élément de construction
Bauteil / Bauelement - Typ

The element type (IfcBuildingElementType) defines a list of commonly shared property set definitions of a building element and an optional set of product representations. It is used to define an element specification (i.e. the specific product information, that is common to all occurrences of that product type).

NOTE  The product representations are defined as representation maps (at the level of the supertype IfcTypeProduct, which gets assigned by an element occurrence instance through the IfcShapeRepresentation.Item[1] being an IfcMappedItem.

A building element type is used to define the common properties of a certain type of a building element that may be applied to many instances of that feature type to assign a specific style. Building element types (or the instantiable subtypes) may be exchanged without being already assigned to occurrences.

The IfcBuildingElementType is an abstract type. Occurrences of subtypes of the IfcBuildingElementType are represented by instances of the appropriate subtypes of IfcBuildingElement.

HISTORY  New entity in IFC2x2.

XSD Specification:

 <xs:element name="IfcBuildingElementType" type="ifc:IfcBuildingElementType" abstract="true" substitutionGroup="ifc:IfcElementType" nillable="true"/>
 <xs:complexType name="IfcBuildingElementType" abstract="true">
  <xs:complexContent>
   <xs:extension base="ifc:IfcElementType"/>
  </xs:complexContent>
 </xs:complexType>

EXPRESS Specification:

ENTITY IfcBuildingElementType
ABSTRACT SUPERTYPE OF(ONEOF(IfcBeamType, IfcBuildingElementProxyType, IfcChimneyType, IfcColumnType, IfcCoveringType, IfcCurtainWallType, IfcDoorType, IfcFootingType, IfcMemberType, IfcPileType, IfcPlateType, IfcRailingType, IfcRampFlightType, IfcRampType, IfcRoofType, IfcShadingDeviceType, IfcSlabType, IfcStairFlightType, IfcStairType, IfcWallType, IfcWindowType))
SUBTYPE OF IfcElementType;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Inheritance Graph:

ENTITY IfcBuildingElementType
ENTITY IfcRoot
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
INVERSE
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;
INVERSE
Types : SET [0:1] OF IfcRelDefinesByType FOR RelatingType;
ENTITY IfcTypeProduct
RepresentationMaps : OPTIONAL LIST [1:?] OF UNIQUE IfcRepresentationMap;
Tag : OPTIONAL IfcLabel;
INVERSE
ReferencedBy : SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcElementType
ElementType : OPTIONAL IfcLabel;
ENTITY IfcBuildingElementType
END_ENTITY;

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