I've recently proposed a family of random number functions for XPath 3.1,
and I included permute() as a primitive on the theory that a native
implementation might be considerably more efficient than a user-written
implementation.
Which, for those that have interest in following it, can be found here, and was
apparently originally reported/requested by Jakub Maly, with Michael's proposal
in comment #4: https://www.w3.org/Bugs/Public/show_bug.cgi?id=20573
As the (publicly viewable) comment #4 states, the proposal was added to the
internal Draft of XPath 3.1. Not much help to you yet, I think, because I
highly doubt that there is already an implementation available that supports
this.
As an aside, you may be interested in using FXSL for random numbers, which has
function (or named template) for this purpose. See for examples:
http://fxsl.sourceforge.net/articles/Random/Casting%20the%20Dice%20with%20FXSL-htm.htm
Cheers,
Abel
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