The clause in the database log file duplicate

I tried to duplicate a database (Oracle RAC 10 g ASM 2 node Windows 2003 Server R2) and in the document of the oracle, it went something like:

DUPLICATE the TARGET DATABASE to dupdb
PFILE = /dup/oracle/dbs/initDUPDB.ora
LOGFILE
' / dup/oracle/oradata/trgt/redo01.log' SIZE 200 K,.
' / dup/oracle/oradata/trgt/redo02.log' SIZE 200 K,.
' / dup/oracle/oradata/trgt/redo03.log' SIZE 200 K;

I thought as the source database RMAN backup already contained the definitions of redo log. Are only these redo log files used for the process during replication of the database? Is the logfile clause is required to use the command DUPLICATE TARGET DATABASE?

Thank you much in advance.

LOG file can be used to specify where the newspapers of recovery for the duplicate database should be placed. This clause is not mandatory and it is really necessary only if you intend to rename the redo log files. If you don't need/want to rename the files, you can use the NOFILENAMECHECK option.

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