#### 5.4.3.9 IfcElementType

| Type d'élément
| Element - Typ

IfcElementType defines a list of commonly shared property set definitions of an 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 instance through the IfcShapeRepresentation.Item[1] being an IfcMappedItem.

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

> HISTORY New entity in IFC2x2

XSD Specification:

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

EXPRESS Specification:

ENTITY IfcElementType

| ABSTRACT SUPERTYPE OF(ONEOF(IfcBuildingElementType, IfcDistributionElementType, IfcFurnishingElementType))

| SUBTYPE OF (IfcTypeProduct);

ElementType | : | OPTIONAL IfcStrippedOptional;

END_ENTITY;

Attribute Definitions:

ElementType | : | 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.

Inheritance Graph:

ENTITY IfcElementType

| 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 IfcStrippedOptional;
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 IfcStrippedOptional;

| INVERSE

ReferencedBy | : | SET OF IfcRelAssignsToProduct FOR RelatingProduct;

| ENTITY IfcElementType

ElementType | : | OPTIONAL IfcStrippedOptional;

END_ENTITY;

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