5.4.3.29 IfcRelAssociatesMaterial

Association de matériau
Ordnet Material zu - Relation

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

XSD 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', 'IFCSHAREDBLDGELEMENTS.IFCWINDOWSTYLE', 'IFCSHAREDBLDGELEMENTS.IFCDOORSTYLE', 'IFCSTRUCTURALANALYSISDOMAIN.IFCSTRUCTURALMEMBER', 'IFCPRODUCTEXTENSION.IFCPORT']) = 0) )) = 0;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Attribute Definitions:

RelatingMaterial : Material definition assigned to the elements or element types.

Formal Propositions:

NoVoidElement : The material information must not be associated to a substraction feature (such as an opening) or to a virtual element.
AllowedElements : The 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.

Inheritance Graph:

ENTITY IfcRelAssociatesMaterial
ENTITY IfcRoot
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcRelationship
ENTITY IfcRelAssociates
RelatedObjects : SET [1:?] OF IfcDefinitionSelect;
ENTITY IfcRelAssociatesMaterial
RelatingMaterial : IfcMaterialSelect;
END_ENTITY;

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