[(] 
{ BACKUPSET 
  { { ALL | completedTimeSpec } 
  | primary_key [, primary_key]... 
  } 
| DATAFILE datafileSpec [, datafileSpec]... 
| DATAFILECOPY 'filename' [, 'filename']... 
| DATAFILECOPY TAG [=] ['] tag_name ['] [, ['] tag_name [']]... 
| TABLESPACE ['] tablespace_name ['] [, ['] tablespace_name [']]... 
| DATABASE 
| archivelogRecordSpecifier
| CURRENT CONTROLFILE [FOR STANDBY] 
| CONTROLFILECOPY 'filename'
| SPFILE
}
[backupSpecOperand [backupSpecOperand]...] 
[)]