Approximate Expiration Date
Approximate date beyond which the resource is no longer offered or available.
The value should be in ISO 8601 date format; specifically YYYY or YYY-MM.
Values may be just a year (e.g. 2026) or a year and a month (e.g. (2026-05). If the full date, i.e. year, month and day, are known use ceterms:expirationDate.