[xacml] Extension of higher-order bag function

I am wondering whether or not XACML allows policy writer to extend
higher-order bag functions. Since current set support sufficient operations
on bag(s), how about disallowing to extend higher-order bag functions (at
least at ver 1.0)?  It makes things simpler.

Michiharu Kudo

IBM Tokyo Research Laboratory, Internet Technology
Tel. +81 (46) 215-4642   Fax +81 (46) 273-7428