RFC 4122, "A Universally Unique IDentifier (UUID) URN Namespace", July 2005Source of RFC: IETF - NON WORKING GROUP
Area Assignment: app
Errata ID: 3970
Reported By: Jennifer Arsenault
Date Reported: 2014-04-19
Rejected by: Barry Leiba
Date Rejected: 2014-05-07
Section 4.1.3 says:
The version number is in the most significant 4 bits of the time stamp (bits 4 through 7 of the time_hi_and_version field).
It should say:
The version number is in the most significant 4 bits of the time_hi_and_version field...
Errata 1957 and 3546 refer to the inconsistent bit numbering. That is a separate issue and has been left out of this correction. This report is in reference to the use of "time stamp" vs "time_hi_and_version field". The version number does not replace the most significant 4 bits of the time stamp. The 4-bit version number is in addition to the 60-bit time stamp.
This seems to be a misunderstanding of the meaning here:
The time_hi_and_version field includes 4 bits for version, followed by the most significant 12 bits of the time stamp. Therefore, the most significant four bits of the time stamp *are* bits 4 thru 7 of the time_hi_and_version field.
That said, this is all a confusing mess, and really could use a revision for clarity.