AddressTCP : Community(?) ProtocolTCP Host Port
AddressTCP : Community(?) ProtocolTCP Port Host
AddressTCP : Community(?) Host ProtocolTCP Port 
AddressTCP : Community(?) Port ProtocolTCP Host
AddressTCP : Community(?) Host ProtocolTCP Port
AddressTCP : Community(?) Host Port ProtocolTCP 
AddressTCP : Community(?) Port Host ProtocolTCP
.... Would include every combination of each of these four fields.

##</code><code>##

PRDSAP01 = 
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = mercury.empire.com)(PORT = 1521))
    )
    (CONNECT_DATA = 
      (SERVICE_NAME = PRDSAP01)
    )
  )