Database.getIdentity(Object) should be able to resolve identity without relying on the object having been loaded from the database

Currently, Database.getIdentity() returns null if the object has not been loaded in the same transaction.

Consider the following scenario:

• An object has been loaded from the database in a previous transaction
• The object hs been marshaled to XML and sent to a client app
• the client marks the object for removal and sends it back
• The server unmarshalls the object in a new transaction- this gives a new instance
• since remove() is also restricted to within transactions, i need to reload the original.
• the obvious way to do that is with the newly received object's identity