The VPM V6 model allows full concurrent engineering which means that any object can be modified independently from the others.
A data model relationship can be added between objects without modifying them. This is true not only for connection relationships, but also for aggregation relationships.
The picture below shows a skateboard model made up of references, representations, instances and representations instances as well as relationships between these objects.
The corresponding data model is as follows:
The geometry contained in "Wheel_Representation" and the attributes of "Wheel R" can be modified by two different users at the same time. This means that modifying "Wheel_Representation" does not modify "Wheel R".
Instantiating "Deck R" below "Skateboard R" does not modify "Skateboard R".