FORMAT Phrase
Literal-1 or identifier-2 specifies the name of the record format to be written. Literal-1, if specified, must be nonnumeric, uppercase, and 10 characters or less in length. Identifier-2, if specified, must refer to an alphanumeric data item, 10 characters or less in length. If identifier-2 contains blanks, the WRITE statement is executed as if the FORMAT phrase were omitted.