FTAM — How does transfer operation determine FileTransferSession object identity

From the description in Chapter 3, it is not clear how the
FileTransferSession::transfer method is actually accomplished.

Chapter 4 Section 4.5.1 describes the FileTransferSession examining
the File reference's attributes to determine whether it is to initiate
the transfer or receive the file. The initiator
FileTransferSession::transfer implementation must then call transfer
again on the target FileTransferSession.

How, in a portable fashion, is a FileTransferSession to determine if
it is the same FileTransferSession referred to in the src or dest File
associated_session attribute?

1. _is_equivalent cannot be used to compare FileTransferSession or other object
references as a false return is inconclusive.
2. There are no object identity operations defined on the
FileTransferSession interface.
3. None of the other File attributes denote unique identity (name,complete_name,
as the src and destination file names can be identical.)

Requested Action: Clarify how the File's attributes allow a FileTransferSession
implementation to determine File ownership.

see above