RE: [xacml] [Polar] PH09: New section 7.4.2 Attributes

>an error case). Functions that do not take attribute bags as arguments may
>still need to recognize the special case of an empty bag.

Can you give an example of such funcition?  That is declared to take a
singleton value, but must recognize an empty bag?

(Java example would be a method that takes a single value
	doStuff(String foo)
but must also recognize when passed in an empty array String[]
which is illegal, and what is exactly the point.
)