IfcMaterialDefinition

BACnet MVD

#### IfcMaterialDefinition

Natural language names

| Materialdefinition
| Material Definition
| Définition de matériau

Change log

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

##### Semantic definitions at the entity

Entity definition

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

Attribute definitions

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

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

##### 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

##### Formal representations

XML 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, IfcMaterialConstituent, IfcMaterialConstituentSet, IfcMaterialLayer, IfcMaterialLayerSet, IfcMaterialProfile, IfcMaterialProfileSet));
INVERSE
AssociatedTo : SET [0:?] OF IfcRelAssociatesMaterial FOR RelatingMaterial;
HasExternalReferences : SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects;
HasProperties : SET [0:?] OF IfcMaterialProperties FOR Material;
END_ENTITY;

EXPRESS-G diagram

`

References: IfcResourceObjectSelect IfcMaterialProperties IfcMaterialSelect IfcObjectReferenceSelect

Link to this page