IFC 4.3.x development

8.10.3.4 IfcMaterialConstituentSet

Change log

IFC4

added

8.10.3.4.1 Semantic definitions at the entity

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.

8.10.3.4.1 Attributes

# Attribute Type Description
IfcMaterialDefinition
AssociatedTo SET [0:?] OF IfcRelAssociatesMaterial FOR RelatingMaterial 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.
HasExternalReferencesSET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjectsReference to external references, e.g. library, classification, or document information, that are associated to the material.

> IFC4 CHANGE  The inverse attribute has been added.
HasProperties SET [0:?] OF IfcMaterialProperties FOR Material Material properties assigned to instances of subtypes of IfcMaterialDefinition.

> IFC4 CHANGE  The inverse attribute has been added.
IfcMaterialConstituentSet
1 Name OPTIONAL IfcLabel The name by which the constituent set is known.
2 Description OPTIONAL IfcText Definition of the material constituent set in descriptive terms.
3 MaterialConstituents OPTIONAL SET [1:?] OF IfcMaterialConstituent Identification of the constituents from which the material constituent set is composed.

8.10.3.4.2 Entity inheritance

dot_inheritance IfcMaterialConstituentSet IfcMaterialConstituentSet IfcMaterialDefinition IfcMaterialDefinition IfcMaterialConstituentSet->IfcMaterialDefinition IfcMaterialDefinition_children 6 more... IfcMaterialDefinition_children->IfcMaterialDefinition

8.10.3.4.3 Formal representations

ENTITY IfcMaterialConstituentSet
 SUBTYPE OF (IfcMaterialDefinition);
	Name : OPTIONAL IfcLabel;
	Description : OPTIONAL IfcText;
	MaterialConstituents : OPTIONAL SET [1:?] OF IfcMaterialConstituent;
END_ENTITY;