We decided not to make date duration functions mandatory for XACML 1.0, because they can be a bear to get right. For conformance tests, I am trying to pin down exactly which functions are "date duration" functions. The following is my understanding: Any function that requires converting a value into a new date value is NOT mandatory. I.e. "7/24/02 plus 10 days = 8/3/02" is NOT mandatory. Any function that requires subtracting two date values to obtain a duration is NOT mandatory. I.e. "8/3/02 - 7/24/02 = 10 days" is NOT mandatory. Any function that adds, subtracts, etc. durations of days, months, or years to yield a new duration IS mandatory. I.e. "8 days plus 10 days = 18 days" IS mandatory. Anne Anderson
Anne.Anderson@Sun.COM Internet Security Research Group, Sun Labs Sun Microsystems, Inc., Burlington, MA