| Permitted value | Language | Designation | Definition |
|---|---|---|---|
| Not known | EN | Not known | It is not known which version was used |
| 7th edition | EN | 7th ed. (used since 2010) | 7th edition (since 2010) |
| 6th edition | EN | 6th. ed (used 2003-2009) | 6th. ed (used 2003-2009) |
| 5th edition | EN | 5th. ed (used 1998-2002) | 5th. ed (used 1998-2002) |
| 4th edition or earlier | EN | 4th. ed (used before 1998) | 4th. ed (used before 1998) |