ONLamp.com has a new tutorial posted today, the next part in their look at the Model-View-Controller method for application development - this time, focusing on the View.

The presentation layer, as I call it, is the View, in common MVC terms. Its sole responsibility is to display information. It could care less about authenticating users, what the data is or, for the most part, where it came from. The only thing it has to worry about is how to render it and where to send it once rendered.

By default, the framework uses Smarty to render the framework. I'm not here to argue semantics, but your presentation layer should consist of a template engine of some sort and a few supporting presentation layers.

They show how, based on the code from previous parts, how to implement the output of the application with the help of the Smarty libraries. They show two methods of output - a normal HTML version for humans to read and a well-formed XML document fit for any number of uses...