IfcMaterialConstituentSet

BACnet MVD

#### IfcMaterialConstituentSet

Natural language names

| Gruppe von Materialbestandteilen
| Material Constituent Set
| Ensemble de matériaux constitutifs

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcMaterialConstituentSet |  |  | ADDED |

##### Semantic definitions at the entity

Entity definition

IfcMaterialConstituentSet is a collection of individual material constituents, each assigning a material to a part of an element. The parts are only identified by a keyword (as opposed to an IfcMaterialLayerSet or IfcMaterialProfileSet where each part has an individual shape parameter (layer thickness or layer profile).

> EXAMPLE The different materials of a window construction shall be provided for the window lining and the window glazing. An IfcMaterialConstituentSet is assigned to the window with two IfcMaterialConstituent's, one with the Name = 'Lining', one with the Name = 'Glazing'.

> 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.

> HISTORY New entity in IFC4.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
1 | Name | IfcLabel | ? | The name by which the constituent set is known. | X | X
2 | Description | IfcText | ? | Definition of the material constituent set in descriptive terms. | X | X
3 | MaterialConstituents | IfcMaterialConstituent | ? S[1:?] | Identification of the constituents from which the material constituent set is composed. | X | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcMaterialDefinition

AssociatedTo

IfcRelAssociatesMaterial
@RelatingMaterial

S[0:?]

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.

X

HasExternalReferences

IfcExternalReferenceRelationship
@RelatedResourceObjects

S[0:?]

Reference to external references, e.g. library, classification, or document information, that are associated to the material.

> IFC4 CHANGE The inverse attribute has been added.

X

HasProperties

IfcMaterialProperties
@Material

S[0:?]

Material properties assigned to instances of subtypes of IfcMaterialDefinition.

> IFC4 CHANGE The inverse attribute has been added.

X

IfcMaterialConstituentSet
1 | Name | IfcLabel | ? | The name by which the constituent set is known. | X | X
2 | Description | IfcText | ? | Definition of the material constituent set in descriptive terms. | X | X
3 | MaterialConstituents | IfcMaterialConstituent | ? S[1:?] | Identification of the constituents from which the material constituent set is composed. | X | X

##### Formal representations

XML Specification
`<xs:element name="IfcMaterialConstituentSet" type="ifc:IfcMaterialConstituentSet" substitutionGroup="ifc:IfcMaterialDefinition" nillable="true"/>
<xs:complexType name="IfcMaterialConstituentSet">
<xs:complexContent>
<xs:extension base="ifc:IfcMaterialDefinition">
<xs:sequence>
<xs:element name="MaterialConstituents" nillable="true" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element ref="ifc:IfcMaterialConstituent" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcMaterialConstituent"/>
<xs:attribute ref="ifc:cType" fixed="set"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="Name" type="ifc:IfcLabel" use="optional"/>
<xs:attribute name="Description" type="ifc:IfcText" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcMaterialConstituentSet
SUBTYPE OF (IfcMaterialDefinition);
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
MaterialConstituents : OPTIONAL SET [1:?] OF IfcMaterialConstituent;
END_ENTITY;

EXPRESS-G diagram

`

References: IfcMaterialConstituent

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