YearOrRange

        Calendar year as a single `value`, a `min`/`max` range, or both. Years
        are expressed as full integer years (CE / Common Era). The fields are independent
        and all optional.
        Display precedence: when both are present, prefer value (the headline year);

fall back to min/max for indicative display.

max
Type: null | integer | string Pattern: ^-?(?:0|[1-9]\d*)$Format: int32

Latest year in the range (e.g. 2005).
min
Type: null | integer | string Pattern: ^-?(?:0|[1-9]\d*)$Format: int32

Earliest year in the range (e.g. 1990).
value
Type: null | integer | string Pattern: ^-?(?:0|[1-9]\d*)$Format: int32

Single calendar year (the headline year, or the midpoint of a range).