Associate Material (FP)

Overview

Provides for the association of a single material with one or more product types or product occurrences.

Generally, all product types and product occurrences may have a material association. The exceptions are subtypes of IfcFeatureElementSubtraction and IfcVirtualElement which, by definition, express the absence of a material.

Where a material is associated with a product type, it is implied that all product occurrences conforming to that type also have the material association. That is, where a material is associated with a product type, product occurrences participating in the IfcRelDefinesByType relationship should not have own material associations.

Results

Material associated with the product type or product occurrence

Description	Entity/Pset/Functional Part	MAN	REC	OPT
For associating a particular material with one or more product occurrence (IfcProduct subtypes)
Specify the product(s) to which the material is to be associated. Any subtype of IfcProduct may have a material specification. The occurrences of IfcProduct selected for a given material specification do not all have to be of the same subtype; the same material may be specified for different subtypes.	IfcProduct (subtypes)
Set the material to be associated with the product occurrence(s) by name only.	IfcMaterial.Name -> IfcLabel
Associate the products as the related objects within the association relationship. Note that the graphical form of the IFC model shows the RelatedObjects attribute having IfcRoot as the datatype. The actual subtype that can be related is however constrained to being IfcProduct through the use of the WHERE rule 2 in the EXPRESS language specification.	IfcRelAssociatesMaterial.RelatedObjects -> IfcProduct
Associate the material as the relating material within the association relationship Note that WHERE rule 1 in the EXPRESS language specification forbids the assignment of a material to a substraction feature (such as an opening) or to a virtual element. This is logical since such features and elements specifically define the absence of material.	IfcRelAssociatesMaterial.RelatingMaterial -> IfcMaterial
Apply the owner history information to the association relationship	IfcRelAssociatesMaterial.OwnerHistory -> fp_apply_owner_history

Description	Entity/Pset/Functional Part	MAN	REC	OPT
For associating a particular material with one or more product types (IfcTypeProduct subtypes)
Specify product type(s) to which the material is to be associated. Any subtype of IfcTypeProduct may have a material specification. The occurrences of IfcTypeProduct selected for a given material specification do not all have to be of the same subtype; the same material may be specified for different subtypes.	IfcTypeProduct (subtypes)
Set the material to be associated with the product type(s) by name only.	IfcMaterial.Name -> IfcLabel
Associate the type products as the related objects within the association relationship. Note that the graphical form of the IFC model shows the RelatedObjects attribute having IfcRoot as the datatype. The actual subtype that can be related is however constrained to being IfcTypeProduct through the use of the WHERE rule 2 in the EXPRESS language specification.	IfcRelAssociatesMaterial.RelatedObjects -> IfcTypeProduct
Associate the material as the relating material within the association relationship.	IfcRelAssociatesMaterial.RelatingMaterial -> IfcMaterial
Apply the owner history information to the association relationship	IfcRelAssociatesMaterial.OwnerHistory -> fp_apply_owner_history

IFC Entities Required
- IfcMaterial
- IfcObject
- IfcProduct
- IfcPropertyDefinition
- IfcRelationship
- IfcRelAssociates
- IfcRelAssociatesMaterial
- IfcRoot
- IfcTypeObject
- IfcTypeProduct

Note that IfcFeatureElementSubtraction and IfcVirtualElement are legal subtypes of IfcProduct that are prohibited from having a material association. These entities are not shown in the EXPRESS-G and EXPRESS specifications below.

IFC Datatypes Required
- IfcGloballyUniqueId
- IfcLabel
- IfcMaterialSelect
- IfcText

IFC Functions Required
- -

IDM Functional Parts Required
- fp_apply_owner_history
- fp_associates_classification (material)

Note that fp_place_object and fp_represent_product are shown in the EXPRESS-G diagram and EXPRESS specification for completeness based on the provisions limiting the association of materials to product types and occurrences. They are not asserted within this functional part.

EXPRESS-G

EXPRESS Schema

SCHEMA FP_ASSOCIATE_MATERIAL;

  TYPE IfcGloballyUniqueId = STRING (22) FIXED;
  END_TYPE;

  TYPE IfcLabel = STRING;
  END_TYPE;

  TYPE IfcText = STRING;
  END_TYPE;

  TYPE IfcMaterialSelect = SELECT
    (IfcMaterial);
  END_TYPE;

  ENTITY IfcMaterial;
      Name : IfcLabel;
  END_ENTITY;

  ENTITY IfcProduct
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcObject);
    WHERE
      WR1 : (EXISTS(Representation) AND EXISTS(ObjectPlacement))
            OR (EXISTS(Representation) AND 
            (NOT('IFC2X2_FINAL.IFCPRODUCTDEFINITIONSHAPE' IN TYPEOF(Representation))))
            OR (NOT(EXISTS(Representation)));
  END_ENTITY;

  ENTITY IfcObject
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcRoot);
      ObjectType      : OPTIONAL IfcLabel;
      ObjectPlacement : OPTIONAL fp_place_object;
      Representation  : OPTIONAL fp_represent_product;
    INVERSE
      HasAssociations : SET OF IfcRelAssociates FOR RelatedObjects;
    WHERE
      WR1 : SIZEOF(QUERY(temp <* IsDefinedBy | 'IFC2X2_FINAL.IFCRELDEFINESBYTYPE' IN TYPEOF(temp))) <= 1;
  END_ENTITY;

  ENTITY IfcRoot
    ABSTRACT SUPERTYPE OF (ONEOF(IfcObject, IfcPropertyDefinition, IfcRelationship));
      GlobalId     : IfcGloballyUniqueId;
      Name         : OPTIONAL IfcLabel;
      Description  : OPTIONAL IfcText;
      OwnerHistory : fp_apply_owner_history;
    UNIQUE
      UR1 : GlobalId;
  END_ENTITY;

  ENTITY IfcPropertyDefinition
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcRoot);
    INVERSE
      HasAssociations : SET OF IfcRelAssociates FOR RelatedObjects;
  END_ENTITY;

  ENTITY IfcRelationship
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcRoot);
  END_ENTITY;

  ENTITY IfcRelAssociates
    SUBTYPE OF(IfcRelationship);
      RelatedObjects : SET [1:?] OF IfcRoot;
    WHERE
      WR1 : SIZEOF(QUERY(temp <* RelatedObjects |
            NOT(('IFC2X2_FINAL.IFCOBJECT' IN TYPEOF(temp)) 
            OR ('IFC2X2_FINAL.IFCPROPERTYDEFINITION' IN TYPEOF(temp)))
            )) = 0;
  END_ENTITY;

  ENTITY IfcRelAssociatesMaterial
    SUBTYPE OF(IfcRelAssociates);
      RelatingMaterial : IfcMaterialSelect;
    WHERE
      WR1 : SIZEOF(QUERY(temp <* SELF\IfcRelAssociates.RelatedObjects | 
            ('IFC2X2_FINAL.IFCFEATUREELEMENTSUBTRACTION' IN TYPEOF(temp))
            OR ('IFC2X2_FINAL.IFCVIRTUALELEMENT' IN TYPEOF(temp))
            )) = 0;
      WR2 : SIZEOF(QUERY(temp <* SELF\IfcRelAssociates.RelatedObjects | 
            NOT(
            ('IFC2X2_FINAL.IFCPRODUCT' IN TYPEOF(temp)) OR
            ('IFC2X2_FINAL.IFCTYPEPRODUCT' IN TYPEOF(temp))
            ))) = 0;
  END_ENTITY;

  ENTITY IfcTypeObject
    SUBTYPE OF(IfcPropertyDefinition);
      ApplicableOccurrence : OPTIONAL IfcLabel;
    WHERE
      WR1 : EXISTS(SELF\IfcRoot.Name);
  END_ENTITY;

  ENTITY IfcTypeProduct
    SUBTYPE OF(IfcTypeObject);
      Tag : OPTIONAL IfcLabel;
    WHERE
      WR41 : NOT(EXISTS(SELF\IfcTypeObject.ObjectTypeOf[1])) OR
             (SIZEOF(QUERY(temp <* SELF\IfcTypeObject.ObjectTypeOf[1].RelatedObjects |
             NOT('IFC2X2_FINAL.IFCPRODUCT' IN TYPEOF(temp)))
             ) = 0);
  END_ENTITY;

  ENTITY fp_associate_classification;
  END_ENTITY;

  ENTITY fp_apply_owner_history;
  END_ENTITY;

  ENTITY fp_place_object;
  END_ENTITY;

  ENTITY fp_represent_product;
  END_ENTITY;

END_SCHEMA;

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Associate Material (FP)

Results

EXPRESS-G

EXPRESS Schema