Looks like it started in 2007 [0], though the content was pretty different, there were some updates over the years, and the current version is indeed from 2013

Looks like it started in 2007 [0], though the content was pretty different, there were some updates over the years, and the current version is indeed from 2013 [1] [0]: https://web.archive.org/web/20071123130628/https://www.x.org/wiki/Development/X12/ https://web.archive.org/web/20071123130628/https://www.x.org... [1]: https://web.archive.org/web/20131222002042/https://www.x.org/wiki/Development/X12/ https://web.archive.org/web/20131222002042/https://www.x.org...