ORCL = 
  (DESCRIPTION = 
    (ADDRESS_LIST = 
        (ADDRESS = (PROTOCOL = TCP)
          (HOST = 127.0.0.1)
          (PORT = 1521)
        )
    )
    (CONNECT_DATA = (SERVICE_NAME = ORCL)
    )
  )
ORCL.WORLD = 
  (DESCRIPTION = 
    (ADDRESS_LIST = 
        (ADDRESS = (PROTOCOL = TCP)
          (HOST = 127.0.0.1)
          (PORT = 1521)
        )
    )
    (CONNECT_DATA = (SERVICE_NAME = ORCL)
    )
  )