Slide 7 of 29
Example from Warboys’ book:
July 1995 (transaction time) Bypass is planned to be built during early 1996 (valid) as shown by abc.
July 1996 (transaction time) The bypass has been completed, but follows a revised route adefc
July 1997 (transaction time) The previous database state was an error: the bypass had not been completed and is still not complete: the segment efc still has to be built during late 1997 or 1998.
