Hello Martin,
the use case is that a customer is using WebProtégé to portray a taxonomy of products. I created an example and imported it to yuuvis. I looks this way:

If the parent value ist empty, it means that it is a root element.
When i create an object based dynamic list it looks this way (please ignore the look of the values):

I want it to look this way (created with a catalog in Designer with child nodes):

Regards, Mathias