Use the change-started element to specify the date on which the change was initiated.
The recommended best practice is to use date strings that conform to the ISO 8601 standard, unless a unix-style machine timestamp is used. The string might contain a date and time (for example, 2007-04-05T12:30-02:00) or just a date (for example, 2014-03-04).
See appendix for information about this element in OASIS document type shells.
- topic/data relmgmt-d/change-started