[UR-WG] Comment on duration format for WallDuration and CpuDuration

[Donal K. Fellows]

Thomas Soddemann wrote:
> ISO8601 allows to set the start date for a given period like in
> 2005-08-09T18:31:42P6M4DT12H30M17S
> which are 5 months, 4 days, 12hours 30 minutes and 17 seconds after 
> 2005-08-09 18:31:42.
> So in principle there is no problem with using the ISO format.

That's not a duration, but rather a time period (which is effectively an
anchored duration). Supporting that would take deep schema hacking
(modifying facets of simple types IIRC) unfortunately, and what's worse,
would not be well supported by tooling.

Donal.