I'm still not sure I understand why you feel you have to express this as extension elements, when extension functions can already do what you (appear to) need?
______________________________________ "... Three things see no end: A loop with exit code done wrong, A semaphore untested, And the change that comes along. ..." -- "Threes" Rev 1.1 - Duane Elms / Leslie Fish ( http://www.ovff.org/pegasus/songs/threes-rev-11.html)
