IfcMaterialConstituentSet

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

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
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
2	Description	IfcText	?	Definition of the material constituent set in descriptive terms.	X
3	MaterialConstituents	IfcMaterialConstituent	? S[1:?]	Identification of the constituents from which the material constituent set is composed.	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

	Gruppe von Materialbestandteilen
	Material Constituent Set
	Ensemble de matériaux constitutifs