IfcRelAssociatesMaterial

Natural language names
Ordnet Material zu - Relation
Rel Associates Material
Association de matériau
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4 4.0.0.0
    IfcRelAssociatesMaterial
      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.

NOTE  As a material layer set usage is an occurrence based information, that applies to each individual element, it cannot be assigned to an element type.

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

NOTE  As a material profile set usage is an occurrence based information, that applies to each individual element, it cannot be assigned to an element type.

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.

NOTE  See the material use definitions at each applicable subtype of IfcElement or IfcElementType for a provision of these keywords.

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

DEPRECATED  The use of IfcMaterialList is deprecated in IFC4 onwards. Use IfcMaterialConstituentSet instead.

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 G
6RelatingMaterialIfcMaterialSelect Material definition assigned to the elements or element types. X
Formal Propositions
RuleDescription
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
#AttributeTypeCardinalityDescriptionG
IfcRoot
1GlobalIdIfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory? 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.
IFC4 CHANGE  The attribute has been changed to be OPTIONAL.
X
3NameIfcLabel? 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? Optional description, provided for exchanging informative comments. X
IfcRelationship
IfcRelAssociates
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.
IFC4 CHANGE  The attribute datatype has been changed from IfcRoot to IfcDefinitionSelect.
X
IfcRelAssociatesMaterial
6RelatingMaterialIfcMaterialSelect Material definition assigned to the elements or element types. X
Definitions applying to General Usage

Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcRelAssociatesMaterial" type="ifc:IfcRelAssociatesMaterial" substitutionGroup="ifc:IfcRelAssociates" nillable="true"/>
 <xs:complexType name="IfcRelAssociatesMaterial">
  <xs:complexContent>
   <xs:extension base="ifc:IfcRelAssociates">
    <xs:sequence>
     <xs:element name="RelatingMaterial">
      <xs:complexType>
       <xs:group ref="ifc:IfcMaterialSelect"/>
      </xs:complexType>
     </xs:element>
    </xs:sequence>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcRelAssociatesMaterial
 SUBTYPE OF (IfcRelAssociates);
  RelatingMaterial : IfcMaterialSelect;
 WHERE
  NoVoidElement : SIZEOF(QUERY(temp <* SELF\IfcRelAssociates.RelatedObjects |
('IFCPRODUCTEXTENSION.IfcFeatureElementSubtraction' IN TYPEOF(temp)) OR
('IFCPRODUCTEXTENSION.IfcVirtualElement' IN TYPEOF(temp))
)) = 0;
  AllowedElements : SIZEOF(QUERY(temp <* SELF\IfcRelAssociates.RelatedObjects | (
SIZEOF(TYPEOF(temp) * [
'IFCPRODUCTEXTENSION.IfcElement',
'IFCPRODUCTEXTENSION.IfcElementType',
'IFCSTRUCTURALANALYSISDOMAIN.IfcStructuralMember',
'IFCPRODUCTEXTENSION.IfcPort',
'IFCSHAREDINFRASTRUCTUREELEMENTS.IfcGeoScienceObservation']) = 0)
)) = 0;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcMaterialDefinition IfcMaterialUsageDefinition

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