IfcMaterialUsageDefinition

Item	SPF	XML	Change	Description
IFC2x3 to IFC4 4.0.0.0
IfcMaterialUsageDefinition			ADDED

Semantic definitions at the entity

Entity definition

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:

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

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
	AssociatedTo	IfcRelAssociatesMaterial @RelatingMaterial	S[1:?]	Use of the IfcMaterialUsageDefinition subtypes within the material association of an element occurrence. The association is established by the IfcRelAssociatesMaterial relationship.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcMaterialUsageDefinition
	AssociatedTo	IfcRelAssociatesMaterial @RelatingMaterial	S[1:?]	Use of the IfcMaterialUsageDefinition subtypes within the material association of an element occurrence. The association is established by the IfcRelAssociatesMaterial relationship.	X

Formal representations

XML 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(ONEOF(IfcMaterialLayerSetUsage, IfcMaterialProfileSetUsage));

 INVERSE

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

END_ENTITY;

 EXPRESS-G diagram

	Definition Materialverwendung
	Material Usage Definition
	Définition d'usage de matériau