#### 5.4.3.18 IfcSpatialElementType

| Type d'élément spatial
| Räumliches Element - Typ

IfcSpatialElementType defines a list of commonly shared property set definitions of a spatial structure element and an optional set of product representations. It is used to define a spatial element specification (the specific element information, that is common to all occurrences of that element 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 spatial element type is used to define the common properties of a certain type of a spatial structure element that may be applied to many instances of that type to assign a specific style. Spatial element types (i.e. the instantiable subtypes) may be exchanged without being already assigned to occurrences.

> NOTE The spatial element types are often used to represent catalogues of predefined spatial types for shared attributes, less so for sharing a common representation map.

The occurrences of subtypes of the abstract IfcSpatialElementType are represented by instances of subtypes of the abstract IfcSpatialElement.

> HISTORY New entity in IFC4.

XSD Specification:

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

EXPRESS Specification:

ENTITY IfcSpatialElementType

| ABSTRACT SUPERTYPE OF(IfcSpatialStructureElementType)

| 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 IfcSpatialElementType

| 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 IfcStrippedOptional;
Tag | : | OPTIONAL IfcStrippedOptional;

| INVERSE

ReferencedBy | : | SET OF IfcRelAssignsToProduct FOR RelatingProduct;

| ENTITY IfcSpatialElementType

ElementType | : | OPTIONAL IfcStrippedOptional;

END_ENTITY;

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