A Proxy representing an aggregation of an Aggregated Resource in an Aggregation which served as a source for the aggregation that this Proxy represents.

When an Aggregated Resource in one Aggregation is due to its inclusion as an Aggregated Resource in a different Aggregation, this property, alongside Proxies which represent the Aggregated Resource in each case, can be used to demonstrate the relationship. The modelling for this is probably a bit soft and needlessly confusing; a relationship between the Aggregation itself and the Proxies that it was derived from might be clearer.