#### 8.8.3.2 IfcMaterialDefinition

| Définition de matériau
| Materialdefinition

IfcMaterialDefinition is a general supertype for all material related information items in IFC that have common material related properties that may include association of material with some shape parameters or assignments to identified parts of a component.

There are three ways of assigning materials to a single component or multiple components; they are characterized as:

- by layer - assigning a material to a layer with constant thickness
- by profile - assigning a material to a profile with a constant of varying shape along an extrusion
- by constituents - assigning a material to an identified part of a component shape; the identification is by a keyword rather than by a shape parameter

Each instantiable subtype of IfcMaterialDefinition may have material properties assigned, or have an external classification of its definition. It can be assigned to either a subtype of IfcElement, or a subtype of IfcElementType by using the objectified relationship IfcRelAssociatesMaterial.

> HISTORY New entity in IFC4

XSD Specification:

<xs:element name="IfcMaterialDefinition" type="ifc:IfcMaterialDefinition" abstract="true" substitutionGroup="ifc:Entity" nillable="true"/>
<xs:complexType name="IfcMaterialDefinition" abstract="true">
<xs:complexContent>
<xs:extension base="ifc:Entity">
<xs:sequence>
<xs:element name="HasProperties" nillable="true" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element ref="ifc:IfcMaterialProperties" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcMaterialProperties"/>
<xs:attribute ref="ifc:cType" fixed="set"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcMaterialDefinition

| ABSTRACT SUPERTYPE OF(ONEOF(IfcMaterial, IfcMaterialProfile, IfcMaterialProfileSet));

| INVERSE

AssociatedTo | : | SET [0:?] OF IfcRelAssociatesMaterial FOR RelatingMaterial;
HasProperties | : | SET OF IfcMaterialProperties FOR Material;

END_ENTITY;

Attribute Definitions:

AssociatedTo | : | Use of the IfcMaterialDefinition subtypes within the material association of an element occurrence or element type. The association is established by the IfcRelAssociatesMaterial relationship. IFC4 CHANGE The inverse attribute has been added.
HasProperties | : | Material properties assigned to instances of subtypes of IfcMaterialDefinition. IFC4 CHANGE The inverse attribute has been added.

Inheritance Graph:

ENTITY IfcMaterialDefinition

| ENTITY IfcMaterialDefinition

| INVERSE

AssociatedTo | : | SET [0:?] OF IfcRelAssociatesMaterial FOR RelatingMaterial;
HasProperties | : | SET OF IfcMaterialProperties FOR Material;

END_ENTITY;

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