The image shows the paths of the swap process
On the right hand side is the world wide web and your web site
At the bottom of the left hand side is your current Website viewed by the general public on the Web
The layer on top of that is a layer of meaning - SWAP/Semantic Annotations, Automatic Fixes, Database
The layer on top of that is the presentational layer - the views Engine
The layer on top of that is multiple alternative versions viewed by Web Users with Disabilities