IfcMaterialRelationship

Item	SPF	XML	Change	Description
IFC2x3 to IFC4 4.0.0.0
IfcMaterialRelationship			ADDED

Semantic definitions at the entity

Entity definition

IfcMaterialRelationship defines a relationship between part and whole in material definitions (as in composite materials). The parts, expressed by the set of RelatedMaterials, are material constituents of which a single material aggregate is composed.

HISTORY New entity in IFC4

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
3	RelatingMaterial	IfcMaterial		Reference to the relating material (the composite).	X
4	RelatedMaterials	IfcMaterial	S[1:?]	Reference to related materials (as constituents of composite material).	X
5	MaterialExpression	IfcLabel	?	Information about the material relationship refering for example to the amount of related materials in the composite material. NOTE Any formal meaning of the Expression string value has to be established in model view definitions or implementer agreements. No such formal language is provided as part of this specification.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcResourceLevelRelationship
1	Name	IfcLabel	?	A name used to identify or qualify the relationship.	X
2	Description	IfcText	?	A description that may apply additional information about the relationship.	X
IfcMaterialRelationship
3	RelatingMaterial	IfcMaterial		Reference to the relating material (the composite).	X
4	RelatedMaterials	IfcMaterial	S[1:?]	Reference to related materials (as constituents of composite material).	X
5	MaterialExpression	IfcLabel	?	Information about the material relationship refering for example to the amount of related materials in the composite material. NOTE Any formal meaning of the Expression string value has to be established in model view definitions or implementer agreements. No such formal language is provided as part of this specification.	X

Formal representations

XML Specification

 <xs:element name="IfcMaterialRelationship" type="ifc:IfcMaterialRelationship" substitutionGroup="ifc:IfcResourceLevelRelationship" nillable="true"/>

 <xs:complexType name="IfcMaterialRelationship">

  <xs:complexContent>

   <xs:extension base="ifc:IfcResourceLevelRelationship">

    <xs:sequence>

     <xs:element name="RelatingMaterial" type="ifc:IfcMaterial" nillable="true"/>

     <xs:element name="RelatedMaterials">

      <xs:complexType>

       <xs:sequence>

        <xs:element ref="ifc:IfcMaterial" maxOccurs="unbounded"/>

       </xs:sequence>

       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcMaterial"/>

       <xs:attribute ref="ifc:cType" fixed="set"/>

       <xs:attribute ref="ifc:arraySize" use="optional"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

    <xs:attribute name="MaterialExpression" type="ifc:IfcLabel" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcMaterialRelationship

 SUBTYPE OF (IfcResourceLevelRelationship);

  RelatingMaterial : IfcMaterial;

  RelatedMaterials : SET [1:?] OF IfcMaterial;

  MaterialExpression : OPTIONAL IfcLabel;

END_ENTITY;

 EXPRESS-G diagram

	Material - Relation
	Material Relationship
	Relation entre matériaux