For the current relationship of this specification to others, see this specification group: SKOS.
| 2009-08-18 | Note |
| 2009-06-15 | Working Draft |
| 2009-03-17 | Working Draft |
| 2008-08-29 | Working Draft |
| 2008-02-21 | First Public Draft |
| 2005-11-02 | Proposed Edited Recommendation |
| 2005-05-10 | First Public Draft |