Unison Release build numbers

Ya, it is as clear as mudd.:
Syntax: A.B.C.D-E

• Field Definitions followed by (number range):
• A = Major Release Number - A (1-255)
• B = Minor Release Number - B (0-255)
• C = Maintenance Release Number - C (0-65535)
• D = Build Type / ES Release Number - D (10000-59999)
• Field D format = XYzzz where X , Y and z represent digit positions:
• digit position indicates the Feature Branch, FCS and Respin number.

Currently defined values are:

• 0 = “below the line” Feature Branch
• 1 = FCS build
• [2-9] = respins.
• Y = This digit is used when we create a Service Update. Values are 1-9.
• zzz = 000 for FCS loads.
• zzz greater than 000 = the ES Release Number. Possible values range from 001 to 999.
• When Y or X increments, zzz is not reset and continues being incremented.
• X increments in the ES build number when the Respin can upgrade to the ES load line, ie when the ES build is a superset of the Respin.
• Y increments in the ES build number when the SU can upgrade to the ES load line, ie when the ES build is a superset of the SU.