An abstract representation of some Aggregated Resource as it exists within a specific Aggregation.

State·ments about Aggregated Resources which are specific to a particular Aggregation need to be made on a Proxy, as such state·ments are not “generally true”. It is recommended that Proxies not be Aggregated Resources themselves, but this isn¦t formally required.

There is no restriction that an Aggregated Resource only have one Proxy for a given Aggregation. The restrictions on and are not formally expressed in , but are made explicit here to preserve the use·fulness of this class.