IfcMaterialConstituent

Item	SPF	XML	Change	Description
4.0.0.0
IfcMaterialConstituent			ADDED

Semantic definitions at the entity

Entity definition

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.

Figure 179 indicates the association of material characteristics to shape aspects and its definition of properties and quantities.

Figure 179 — shape aspects for associating material, properties and quantities

HISTORY New entity in IFC4

Attribute definitions

#	Attribute	Type	Cardinality	Description	R
1	Name	IfcLabel	?	The name by which the material constituent is known.	X
2	Description	IfcText	?	Definition of the material constituent in descriptive terms.	X
3	Material	IfcMaterial		Reference to the material from which the constituent is constructed.	X
4	Fraction	IfcNormalisedRatioMeasure	?	Optional provision of a fraction of the total amount (volume or weight) that applies to the IfcMaterialConstituentSet that is contributed by this IfcMaterialConstituent.	X
5	Category	IfcLabel	?	Category of the material constituent, e.g. the role it has in the constituent set it belongs to.	X
	ToMaterialConstituentSet	IfcMaterialConstituentSet @MaterialConstituents		Material constituent set in which this material constituent is included.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	R
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.
	HasProperties	IfcMaterialProperties @Material	S[0:?]	Material properties assigned to instances of subtypes of IfcMaterialDefinition. IFC4 CHANGE The inverse attribute has been added.	X
IfcMaterialConstituent
1	Name	IfcLabel	?	The name by which the material constituent is known.	X
2	Description	IfcText	?	Definition of the material constituent in descriptive terms.	X
3	Material	IfcMaterial		Reference to the material from which the constituent is constructed.	X
4	Fraction	IfcNormalisedRatioMeasure	?	Optional provision of a fraction of the total amount (volume or weight) that applies to the IfcMaterialConstituentSet that is contributed by this IfcMaterialConstituent.	X
5	Category	IfcLabel	?	Category of the material constituent, e.g. the role it has in the constituent set it belongs to.	X
	ToMaterialConstituentSet	IfcMaterialConstituentSet @MaterialConstituents		Material constituent set in which this material constituent is included.

Formal representations

XML 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:attribute name="Description" type="ifc:IfcText" use="optional"/>

    <xs:attribute name="Fraction" type="ifc:IfcNormalisedRatioMeasure" use="optional"/>

    <xs:attribute name="Category" type="ifc:IfcLabel" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcMaterialConstituent

 SUBTYPE OF (IfcMaterialDefinition);

  Name : OPTIONAL IfcLabel;

  Description : OPTIONAL IfcText;

  Material : IfcMaterial;

  Fraction : OPTIONAL IfcNormalisedRatioMeasure;

  Category : OPTIONAL IfcLabel;

 INVERSE

  ToMaterialConstituentSet : IfcMaterialConstituentSet FOR MaterialConstituents;

END_ENTITY;

 EXPRESS-G diagram

	Materialbestandteil
	Material Constituent
	Matériau constitutif