Variable length lists of property values (groups) in PVMT

Hi, the same property value group could be applied to an element multiple times e.g. to describe references to multiple elements in another model (each set of values in one instance of the PVG would describe a reference to one source element). In this case, there is a variable number of references. Effectively, it is a list of references. So predefining different PVGs is not an option. Could PVMT be extended to support such a list of PV(G)s?

( This question has been posted also in an older thread Multi-valued property values)