I am trying to make use of the new association and dataset capabilities and ran into a problem constructing a hierarchical structure, as in the code below. Do any of you see what i am doing wrong?

(* define an association *)
as = Association[{}]

(* \[LeftAssociation]\[RightAssociation] *)

(* add a key \[Rule] value at the top level *)
AssociateTo[as, "name" -> "myName"]

(* \[LeftAssociation]"name"\[Rule]"myName"\[RightAssociation] *)

(* add another key whose value is an association *)
AssociateTo[as, "summary" -> Association[{}]]

(* \[LeftAssociation]"name"\[Rule]"myName","summary"\[Rule]\
\[LeftAssociation]\[RightAssociation]\[RightAssociation] *)

(* so as[["summary"]] is an association *)
as[["summary"]] // Head

(* Association *)

(* so why can't I add a key\[Rule]value to it? *)
AssociateTo[as[["summary"]], "stuff" -> "someStuff"]

AssociateTo::rvalue: as[[summary]] is not a variable with a value, so its value cannot be changed. >>

AssociateTo[as[["summary"]], "stuff" -> "someStuff"]

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