| Informal description | Apr 2006 |
| Draft 1 specification (PDF) | 29 Dec 2022 |
| Draft 1 specification (TEX) | 29 Dec 2022 |
| Draft 1 diagram (PNG) | 29 Dec 2022 |
| Draft 1 note A | 29 Dec 2022 |
| Draft 1 note B | 30 Dec 2022 |
| Draft 1 note C | 30 Dec 2022 |
| Draft 1 note D | 6 Mar 2024 |
| Draft 1 note E | 6 Mar 2024 |
| Draft 1 note F | 6 Mar 2024 |
| Draft 1 note G | 26 Mar 2024 |
| Draft 2 specification (PDF) | Apr 2024 |
| Draft 2 specification (TEX) | Apr 2022 |
