New UI framework: Most likely, we will have to modify our HTML or XML, or combine this with dynamic updating to allow us to create the UI as a function of some state. I mean a function or an object to which we feed the data of our application: for example, if we have unread, this function will look like f (false) or f (true). In these cases, we build two different trees. To do this, we will have to combine Markup and Dynamic, which we have at the third level, and build a fourth level framework that allows us......