5.5.1 Release[44] 15 November 2019 current standard, minor text modifications to 5.5.1 Draft. 5.6 Private Draft -[45] "Jed Allen sent those two files to a few people only for sort of "private comments"[46] 6.0 XML Draft 28 December 2001[47] Was not a complete specification, and not recommended to begin to software implementations.