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Subject: Re: [xacml] Errata: missing duration functions
> dayTimeDuration and yearMonthDuration as standard XACML DataTypes > were added fairly late in the XACML 1.0 process. One of the > primary motivating use-cases for the duration DataTypes was being > able to say things like "permit if current date minus subject > birthdate is greater than or equal to 21". These expressions > require some way to subtract dates. Note that there already exist dateTime-[add|subtract]-[dayTime|yearMonth]Duration functions. This means that you can say: today - (21 year duration) >= Subject's BDay This yields the same data in a different way. I don't know if this meets other needs for duration functions, or if this changes the urgency for getting these duration functions into 1.1. That said, I think the duration functions being proposed seem reasonable. seth
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