The DefinedByMaterialClass is a concrete ReferenceType that can be used directly. It is a subtype of NonHierarchicalReferences.
Table 99 - DefinedByMaterialClass ReferenceType
|Subtype of DefinedBy ReferenceType defined in 9.2.7|
This ReferenceType is used to describe a categorization of the SourceNode. The Object identified by the SourceNode has the same features as that defined by the Object specified by TargetNode.
The SourceNode of this ReferenceType shall be an Object of MaterialDefinitionType or its subtype.
The TargetNode of this ReferenceType shall be an Object of MaterialClass or its subtype.