#### 8.8.3.6 IfcMaterialUsageDefinition

| Définition d'usage de matériau
| Definition Materialverwendung

IfcMaterialUsageDefinition is a general supertype for all material related information items in IFC that have occurrence specific assignment parameters to assign a set of materials with shape parameters to a reference geometry item of that component.

There are two ways of assigning a set of materials with shape parameters:

- a layer set to a reference curve - assigning a material layer set with material layers having a sequence and thickness parameter to a reference curve of an element - represented by the 'Axis' shape representation of that element
- a profile set to a cardinal point - assigning a material profile set with assigned profile geometry and insertion points to a reference curve by an offset, called "cardinal point" - the reference curve is represented by the 'Axis' shape representation of that element

Each instantiable subtype of IfcMaterialUsageDefinition has to be assigned to a subtype of IfcElement by using the objectified relationship IfcRelAssociatesMaterial; it is only valid in conjunction with an element occurrence.

> HISTORY New entity in IFC4

Informal Propositions:

1. It is illegal to assign a subtype of IfcMaterialUsageDefinition to a subtype of IfcElementType, it shall only be assigned to an element occurrence.

XSD Specification:

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

EXPRESS Specification:

ENTITY IfcMaterialUsageDefinition

| ABSTRACT SUPERTYPE OF(IfcMaterialProfileSetUsage);

| INVERSE

AssociatedTo | : | SET [1:?] OF IfcRelAssociatesMaterial FOR RelatingMaterial;

END_ENTITY;

EXPRESS-G diagram

Attribute Definitions:

AssociatedTo | : | Use of the IfcMaterialUsageDefinition subtypes within the material association of an element occurrence. The association is established by the IfcRelAssociatesMaterial relationship.

Inheritance Graph:

ENTITY IfcMaterialUsageDefinition

| ENTITY IfcMaterialUsageDefinition

| INVERSE

AssociatedTo | : | SET [1:?] OF IfcRelAssociatesMaterial FOR RelatingMaterial;

END_ENTITY;

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