EmptyPeriod
Empty interval shall not be confused with zero-length interval.
The empty interval has an empty intersection with any other interval. It is used to explicitly tell "never".
EmptyPeriod
Empty interval shall not be confused with zero-length interval.
The empty interval has an empty intersection with any other interval. It is used to explicitly tell "never".
comment
Empty interval shall not be co ...... ed to explicitly tell "never".