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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
> require some way to subtract dates.

Note that there already exist
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.


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