For the current relationship of this specification to others, see this specification group: Voice.
| 2008-10-14 | Pronunciation Lexicon Specification (PLS) Version 1.0 Recommendation |
| 2008-08-18 | Proposed Recommendation |
| 2007-12-12 | Candidate Recommendation |
| 2006-10-26 | Last Call Working Draft |
| 2006-01-31 | Last Call Working Draft |
| 2005-02-14 | First Public Draft |