Suggestion on parallelism / time-period trait for function(s)... .

Hi,
It would be great if the function(s) implementation in XSLT processor(s)
can give mandates for 
	a) parallelism as yes/no.
	Reason:
	 1. This would allow XSLT parser implementor(s) to have unified
behavior for function(s)
	    to a certain extent.
	 2. Allow parallelism would enhance/define performance for functions
like document(...).
	
	or	

	b) time-period as linear/constant/etc. 
	( constant time could mean implementation must be parallel )
	Reason:
	1. Just like STL functions tell end-user the time effects of using
	   different types of functions.


regards


Raja