<longfile_spec>
::=
LONGFILE <valCOLUMN_ID> <longfile_code_spec>
| LONGFILE <valCOLUMN_NAME> <longfile_code_spec>
| LONGFILE <valCOLUMN_ID> <valFILE_NAME>
[<longfile_code_spec>]
| LONGFILE <valCOLUMN_NAME> <valFILE_NAME>
[<longfile_code_spec>]