| Datatype | Class | Description |
|---|---|---|
| NATIONAL CHARACTER(n) | STRING | Space-filled character string of n characters |
| NATIONAL CHAR(n) | STRING | Synonym for CHARACTER(n) |
| NATIONAL STRING(n) | STRING | Null-terminated character string of n characters |
| NATIONAL VARCHAR(n)* | STRING | String of max n characters, with length variable |
| NATIONAL CLOB(n)* | STRING | Character large object of max n characters, with length variable |
| * Omnidex recommends use of the NATIONAL CHARACTER and NATIONAL STRING datatypes rather than NATIONAL VARCHAR and NATIONAL CLOB due to the requirement of a length variable. | ||