Natural language names
deOrdnet Material zu - Relation
enRel Associates Material
frAssociation de matériau
Change log
IFC2x3 to IFC4
      OwnerHistoryMODIFIEDInstantiation changed to OPTIONAL.
      RelatedObjectsXXMODIFIEDType changed from IfcRoot to IfcDefinitionSelect.
Semantic definitions at the entity
Entity definition

IfcRelAssociatesMaterial is an objectified relationship between a material definition and elements or element types to which this material definition applies.

The material definition can be:

Materials can be arranged by layers and applied to layered elements. Typical elements are walls and slabs.

Material can be applied to profiles. Typical elements using profile material are beam, column, member

Materials can be arranged by identified parts of a component based element. Typical elements are dorrs/windows (with components such as lining, framing and glazing), or distribution elements.

As a fallback, or in cases where only a single material information is needed, material information can be directly associated

The IfcRelAssociatesMaterial relationship is a special type of the IfcRelAssociates relationship. It can be applied to subtypes of IfcElement and subtypes of IfcElementType.

If both, the element occurrence (by an instance of IfcElement) and the element type (by an instance of IfcElementType, connected through IfcRelDefinesByType) have an associated material, then the material associated to the element occurrence overrides the material associated to the element type.

HISTORY  New entity in IFC2x.

Informal Propositions:

  1. An IfcMaterialLayerSetUsage shall not be associated with a subtype of IfcElementType, it should only be associated with individual occurrences
  2. An IfcMaterialProfileSetUsage shall not be associated with a subtype of IfcElementType, it should only be associated with individual occurrences
Attribute definitions
#AttributeTypeCardinalityDescription C
6RelatingMaterialIfcMaterialSelect[1:1] Material definition assigned to the elements or element types. X
Formal Propositions
NoVoidElementThe material information must not be associated to a substraction feature (such as an opening) or to a virtual element.
AllowedElementsThe material information, using IfcMaterialSelect should be associated to an element occurrence (including structural members) or an element type (including the door and window styles). Also port can have assigned materials, here indicating the fluid flowing from the port.
Inherited definitions from supertypes
Entity inheritance IfcRelAssociates IfcRelationship IfcRoot
Attribute inheritance
1GlobalIdIfcGloballyUniqueId[1:1] Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory[0:1] Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object,
NOTE  only the last modification in stored - either as addition, deletion or modification.
3NameIfcLabel[0:1] Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule. X
4DescriptionIfcText[0:1] Optional description, provided for exchanging informative comments.X
5RelatedObjectsIfcDefinitionSelectS[1:?] Set of object or property definitions to which the external references or information is associated. It includes object and type objects, property set templates, property templates and property sets and contexts. X
6RelatingMaterialIfcMaterialSelect[1:1] Material definition assigned to the elements or element types. X
Definitions applying to Common Use Definitions

Concept inheritance

#ConceptModel View
Software IdentityCommon Use Definitions
Revision ControlCommon Use Definitions
Formal representations
XSD Specification
 <xs:element name="IfcRelAssociatesMaterial" type="ifc:IfcRelAssociatesMaterial" substitutionGroup="ifc:IfcRelAssociates" nillable="true"/>
 <xs:complexType name="IfcRelAssociatesMaterial">
   <xs:extension base="ifc:IfcRelAssociates">
     <xs:element name="RelatingMaterial">
       <xs:group ref="ifc:IfcMaterialSelect"/>
EXPRESS Specification
ENTITY IfcRelAssociatesMaterial
 SUBTYPE OF (IfcRelAssociates);
  RelatingMaterial : IfcMaterialSelect;

Link to EXPRESS-G diagram EXPRESS-G diagram

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