|  A simple example based on California hunting season regulations
|  http://www.dfg.ca.gov/fg_comm/regs.html  One date has been changed for demonstration purposes

|        You can run these rules in a browser, using the Internet Business Logic system
|                          at  www.reengineeringllc.com


hunting deer is permitted in zone some-zone from some-start-date1 to some-end-date1
hunting bear is permitted in zone that-zone from some-start-date2 to some-end-date2
the period that-start-date1 to that-end-date1 overlaps with the period that-start-date2 to that-end-date2
---------------------------------------------------------------------------------------------------------
in zone that-zone the deer and bear hunting seasons overlap


hunting deer is permitted in zone this-zone from this-start-date to this-end-date
=================================================================================
                                  A              20030809          20030921
                                  B1             20030920          20031026
                                  B2             20030920          20031026


hunting bear is permitted in zone this-zone from this-start-date to this-end-date
=================================================================================
                                  A              20030809          20031228
                                  B1             20030920          20031228
                                  B2             20031027          20031228


some-start1 is less than or equal some-end2
some-start2 is less than or equal some-end1
-------------------------------------------------------------------------------------
the period that-start1 to that-end1 overlaps with the period that-start2 to that-end2