#### 8.8.3.2 IfcMaterialConstituent

| Matériau constitutif
| Materialbestandteil

IfcMaterialConstituent is a single and identifiable part of an element which is constructed of a number of part (one or more) each having an individual material. The association of the material constituent to the part is provided by a keyword as value of the Name attribute. In order to identify and distinguish the part of the shape representation to which the material constituent applies the IfcProductDefinitionShape of the element has to include instances of IfcShapeAspect, using the same keyword for their Name attribute.

> NOTE See the "Material Use Definition" at the individual element to which an IfcMaterialConstituentSet may apply for a required or recommended definition of such keywords as value for IfcMaterialConstituent.Name.

> HISTORY New entity in IFC4

XSD Specification:

<xs:element name="IfcMaterialConstituent" type="ifc:IfcMaterialConstituent" substitutionGroup="ifc:IfcMaterialDefinition" nillable="true"/>
<xs:complexType name="IfcMaterialConstituent">
<xs:complexContent>
<xs:extension base="ifc:IfcMaterialDefinition">
<xs:sequence>
<xs:element name="Material" type="ifc:IfcMaterial" nillable="true"/>
</xs:sequence>
<xs:attribute name="Name" type="ifc:IfcLabel" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcMaterialConstituent

| SUBTYPE OF (IfcMaterialDefinition);

Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcStrippedOptional;
Material | : | IfcMaterial;
Fraction | : | OPTIONAL IfcStrippedOptional;
Category | : | OPTIONAL IfcStrippedOptional;

| INVERSE

ToMaterialConstituentSet | : | IfcMaterialConstituentSet FOR MaterialConstituents;

END_ENTITY;

Attribute Definitions:

Name | : | The name by which the material constituent is known.
Description | : | Definition of the material constituent in descriptive terms.
Material | : | Reference to the material from which the constituent is constructed.
Fraction | : | Optional provision of a fraction of the total amount (volume or weight) that applies to the IfcMaterialConstituentSet that is contributed by this IfcMaterialConstituent.
Category | : | Category of the material constituent, e.g. the role it has in the constituent set it belongs to.
ToMaterialConstituentSet | : | Material constituent set in which this material constituent is included.

Inheritance Graph:

ENTITY IfcMaterialConstituent

| ENTITY IfcMaterialDefinition

| INVERSE

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

| ENTITY IfcMaterialConstituent

Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcStrippedOptional;
Material | : | IfcMaterial;
Fraction | : | OPTIONAL IfcStrippedOptional;
Category | : | OPTIONAL IfcStrippedOptional;

| INVERSE

ToMaterialConstituentSet | : | IfcMaterialConstituentSet FOR MaterialConstituents;

END_ENTITY;

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