     # If the entity or session does not exist, nothing gets defined.
     # Please refer to source code, as it contains important details.
     dereference: (container, callback) ->
+        sid = @constructor.ACCESS_SESSION_SYMBOL
+        key = @constructor.ACCESS_CONTAINER_SYMBOL
         {series, apply} = async or require "async"
-        key = @constructor.ACCESS_CONTAINER_SYMBOL
-        assert not _.isEmpty(key), "no access symbol"
-        assert sid = "x-authenticate-entity" # external
+        assert not _.isEmpty(key), "got no access symbol"
+        assert not _.isEmpty(sid), "got no session symbol"
         isVanillaSession = _.isObject container.cookie
         container = session: container if isVanillaSession
         return callback() unless session = container.session

        noSave = "the session has not save function"
        noSession = "container has no session object"
        message = "Persisted %s entity against session"
        isVanillaSession = _.isObject container.cookie
        container = session: container if isVanillaSession
        symbol = @constructor.ACCESS_CONTAINER_SYMBOL
        assert session = container?.session, noSession
        assert not _.isEmpty(symbol), "no access symbol"
        assert _.isObject(entity), "malformed entity"
        surrogate = _.unique @constructor.hibernation()
        functions = (o.implement.bind @ for o in surrogate)
        boxd = (obj) -> (apply fn, obj for fn in functions)
        fasn = (o, c) -> series boxd(o), (e, r) -> c(e, o)

        @hibernateEntity entity, (error, content) =>
            return callback error, undefined if error
            assert not _.isEmpty(content), "no content"
            try session[external.toString()] = content
            assert _.isFunction(session.save), noSave
            session.cookie.maxAge = 2628000000 if rme
            session.random = _.random 0, 1, yes # force
