ABSTRACT This definition may not be instantiated
IfcMaterialUsageDefinition is a general supertype for all material related information items in IFC that have occurrence specific assignment parameters to assign a set of materials with shape parameters to a reference geometry item of that component.
There are two ways of assigning a set of materials with shape parameters:
- a layer set to a reference curve - assigning a material layer set with material layers having a sequence and thickness parameter to a reference curve of an element - represented by the 'Axis' shape representation of that element
- a profile set to a cardinal point - assigning a material profile set with assigned profile geometry and insertion points to a reference curve by an offset, called "cardinal point" - the reference curve is represented by the 'Axis' shape representation of that element
Each instantiable subtype of IfcMaterialUsageDefinition has to be assigned to a subtype of IfcElement by using the objectified relationship IfcRelAssociatesMaterial; it is only valid in conjunction with an element occurrence.
- It is illegal to assign a subtype of IfcMaterialUsageDefinition to a subtype of IfcElementType, it shall only be assigned to an element occurrence.
|AssociatedTo||SET [1:?] OF IfcRelAssociatesMaterial FOR RelatingMaterial|
ENTITY IfcMaterialUsageDefinition ABSTRACT SUPERTYPE OF (ONEOF (IfcMaterialLayerSetUsage ,IfcMaterialProfileSetUsage)); INVERSE AssociatedTo : SET [1:?] OF IfcRelAssociatesMaterial FOR RelatingMaterial; END_ENTITY;