OASIS eXtensible Access Control Markup Language (XACML) TC

  • 1.  The duration data types

    Posted 07-02-2008 16:11 
    All,

Why is the xs:duration datatype not part of XACML, while the two 
restrictions on this data type, xs:dayTimeDuration and 
xs:YearMonthDuration are?

Should we include xs:duration and the function ...:dayTime-add-duration?

It seems strange that currently it is possible to add a year and a month 
to a datetime, or add a day and a time, but you cannot do both at once. 
Was there a reason for this?

Regards,
Erik


  • 2.  Re: [xacml] The duration data types

    Posted 07-08-2008 13:22 
    All,

I have tried to search the XACML email archives for this issue.

I found the following discussion which mentions restricting the general 
XML schema data type to yearMonth and DayTime:

http://lists.oasis-open.org/archives/xacml/200207/msg00133.html

So it appears it was a conscious decision.

I found the following discussion which mentions that the data types were 
introduces to cover the use case of "being 21":

http://lists.oasis-open.org/archives/xacml/200305/msg00061.html

Since there seems to be some kind of motivation for the current design, 
although it is not entirely clear to me, and since it is easier to add 
new functions in some future specification than it is to clean up things 
if we end up with needless functions, I would lean towards not 
introducing the xs:duration data type in 3.0.

In the worst case it is possible to add a full duration to a datetime by 
doing a two step procedure where you add the yearMonth and dayTime parts 
separately.

Any thoughts?

Best regards,
Erik


Erik Rissanen wrote:
> All,
>
> Why is the xs:duration datatype not part of XACML, while the two 
> restrictions on this data type, xs:dayTimeDuration and 
> xs:YearMonthDuration are?
>
> Should we include xs:duration and the function ...:dayTime-add-duration?
>
> It seems strange that currently it is possible to add a year and a 
> month to a datetime, or add a day and a time, but you cannot do both 
> at once. Was there a reason for this?
>
> Regards,
> Erik
>
>
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