Emmanuel Dreyfus writes:
For instance, if I want users that march &(a1=v1)(a2=v2)(a3=v3), I can write this:
access to ... by set.exact="user/a1 + user/a2 + user/a3 & [v1v2v3]" write
"by" takes multiple expressions and "and"s them, so this should work:
access to ... by set.exact="user/a1 & [v1]" set.exact="user/a2 & [v2]" set.exact="user/a3 & [v3]" read
Note - one "by", not three.