#### 5.1.3.20 IfcTypeProduct

| Définition d'un type de produit
| Produkt (allgemein) - Typ

IfcTypeProduct defines a type definition of a product without being already inserted into a project structure (without having a placement), and not being included in the geometric representation context of the project. It is used to define a product specification, that is, the specific product information that is common to all occurrences of that product type.

An IfcTypeProduct may have a list of property set attached and an optional set of product representations. Values of these properties and the representation maps are common to all occurrences of that product type. The type-occurrence relationship is realized using the objectified relationship IfcRelDefinesByType.

> NOTE The product representations are defined as representation maps, which may be assigned by a product instance through the representation item(s) being an IfcShapeRepresentation and having Items of type IfcMappedItem.

The representations at the occurrence level (represented by subtypes of IfcProduct) can override the specific representations at the type level:

- for geometric representations, a Cartesian transformation operator can be applied at the occurrence level.
- for property sets, a property within an occurrence property set, assigned at the product occurrence, overrides the same property assigned to the product type.

An IfcTypeProduct may be exchanged without being already assigned to subtypes of IfcProduct.

> HISTORY New entity in IFC2x.

> IFC4 CHANGE The entity IfcTypeProduct shall not be instantiated from IFC4 onwards. It will be changed into an ABSTRACT supertype in future releases of IFC.

Geometry use definition

The RepresentationMaps define the type product shape and multiple geometric representations can be assigned. If a product occurrence is assigned to the type by using the IfcRelDefinesByType relationship, then these occurrences have to reference the representation maps. The reference is created by one or multiple IfcShapeRepresentation's having an IfcMappedItem as Items, that places the IfcRepresentationMap of the type product into the spatial contexts, i.e. by using an Cartesian transformation operator to transform the IfcRepresentationMap into the object coordinate system of the product occurrence.

Figure 20 illustrates an example of referencing a representation map by the shape representation of a product occurrence. Here the Cartesian transformation operator only uses translation, but no rotation, mirroring, or scaling.

Figure 20 — Product type geometry with single placement

Figure 21 illustrates an example of referencing a representation multiple times map by the shape representation of a product occurrence. Here the Cartesian transformation operator only uses translation, but no rotation, mirroring, or scaling. The different translation values determine the pattern of the multiple placement.

Figure 21 — Product type geometry with multiple placement

XSD Specification:

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

EXPRESS Specification:

ENTITY IfcTypeProduct

| SUPERTYPE OF(IfcElementType)

| SUBTYPE OF (IfcTypeObject);

RepresentationMaps | : | OPTIONAL LIST [1:?] OF UNIQUE IfcStrippedOptional;
Tag | : | OPTIONAL IfcStrippedOptional;

| INVERSE

| WHERE

ApplicableOccurrence | : | NOT(EXISTS(SELF\IfcTypeObject.Types[1])) OR (SIZEOF(QUERY(temp <* SELF\IfcTypeObject.Types[1].RelatedObjects | NOT('IFCKERNEL.IFCPRODUCT' IN TYPEOF(temp))) ) = 0);

END_ENTITY;

Attribute Definitions:

Tag | : | The tag (or label) identifier at the particular type of a product, e.g. the article number (like the EAN). It is the identifier at the specific level.

Formal Propositions:

ApplicableOccurrence | : | The product type (or style), if assigned to an object, shall only be assigned to object being a sub type of IfcProduct.

Inheritance Graph:

ENTITY IfcTypeProduct

| ENTITY IfcRoot

GlobalId | : | IfcGloballyUniqueId;
OwnerHistory | : | OPTIONAL IfcOwnerHistory;
Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcText;

| ENTITY IfcObjectDefinition

| INVERSE

HasAssignments | : | SET OF IfcRelAssigns FOR RelatedObjects;
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 IfcStrippedOptional;

| INVERSE

Types | : | SET [0:1] OF IfcRelDefinesByType FOR RelatingType;

| ENTITY IfcTypeProduct

RepresentationMaps | : | OPTIONAL LIST [1:?] OF UNIQUE IfcStrippedOptional;
Tag | : | OPTIONAL IfcStrippedOptional;

| INVERSE

END_ENTITY;

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