> I'm trying to determine whether no instance of <c/> exists for each
> <b/> set.

what do you actually mean by this

test="not(b/c)"

is true if there are no c grandcildren.

If you mean that you want the test to be true unless 
that every b child has a c child then that's
not the case taht there is a b that has not got a c so:

test="not(b[not(c)])"


David

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