baka-baka.js

var obj = function() {}
obj.prototype.f = function(name) { if (this[name] === void 0) this[name] = new obj; return this[name] }
obj.prototype.get = function(name) { return this[name] }
obj.prototype.set = function(name, value) { this[name] = value }

// Usage:
var x = new obj

x.f("file").f("document").f("properties").set("т прнс?", true)

x.f("file").f("document").f("properties").get("т прнс?")
// -> true