asso = <|"x" -> { <|"a" -> 5, "b" -> "y", "c" -> {5, 6, 7}|>, <|"a" -> 6, "b" -> "z", "c" -> {}|>} |> I want to find "x" value's element where "c" value is {} and modify its "b" value by applying Framed to it. asso // Query["x", Select[#c === {} &], Framed@*"b"] {Framed["z"]} But...