@JonathanGregory , thanks for working on the details.  Sorry about this late 
reply.  Referring again to PR #315:

> ... After the deprecation of year zero in reference date/time, I'd like to 
> add the following for the avoidance of doubt. Alternatively it could be 
> inserted after "prohibited for certain calendars, as noted below."
> 
> > Date/times in zero or negative years are prohibited by calendars which 
> > prohibit these years in the reference date/time. In these calendars, it is 
> > an error to store or decode a time coordinate value for a date/time earlier 
> > than 1-1-1 0:0:0, regardless of the reference date/time in the time `units`.

This seems to be fully redundant with my current wording.  In each of the 
appropriate calendar descriptions, I already have:

> Date/times earlier than 1-1-1 0:0:0 are prohibited.

Then at the bottom, I have:

> Some calendars have a restricted time range, as noted, to avoid multiple 
> interpretations. These restrictions apply to both the reference date/time 
> string, and to encoded time values.

Perhaps you missed this bottom part?  Should this be repositioned to make it 
easier to see?  Note also that I am making some effort to keep the wording 
reasonably concise, and to avoid unnecessary repetition.

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