difference entre base.world et base dans tnsnames.ora

Bonjour,

quelle est la différence entre 'base1.world' et 'base1' dans un tnsnames.ora

Code:

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base1.world = 
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = host1)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = n1)
    )
  )
base1 = 
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = host1)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = n1)
    )
)

merci pour votre aide