UMLAggregation is used to describe that an element of the class is made up of elements of other classes; it is mapped to subtypes of the OPC UA Aggregates ReferenceType ( see Table 8).
Table 8 – Transformation rule of the elements of UMLAggregation
| ISA-95 | OPC UA | Description | 
| UMLRole | SourceNode, TargetNode | UMLRole may be transformed into the restrictions of ReferenceType. | 
| UMLCardinality | N/A | Standard ModellingRules only affect instance declaration specified by sub-types of Hierarchical References. | 
| UMLAssociation Name | BrowseName | A name defined in ISA-95 may be changed. InverseName will be defined. |