IFC 4.3.x development

8.10.3.3 IfcMaterialConstituent

Change log

IFC4

added

8.10.3.3.1 Semantic definitions at the entity

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.

HISTORY New entity in IFC4

8.10.3.3.1 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.
HasExternalReferences SET [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.
IfcMaterialConstituent
1 Name OPTIONAL IfcLabel The name by which the material constituent is known.
2 Description OPTIONAL IfcText Definition of the material constituent in descriptive terms.
3 Material IfcMaterial Reference to the material from which the constituent is constructed.
4 Fraction OPTIONAL IfcNormalisedRatioMeasure Optional provision of a fraction of the total amount (volume or weight) that applies to the IfcMaterialConstituentSet that is contributed by this IfcMaterialConstituent.
5 Category OPTIONAL IfcLabel Category of the material constituent, e.g. the role it has in the constituent set it belongs to.
ToMaterialConstituentSetIfcMaterialConstituentSet FOR MaterialConstituents Material constituent set in which this material constituent is included.

8.10.3.3.2 Entity inheritance

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

8.10.3.3.3 Formal representations

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;