I have read the book “Restful Web services”. In that book it described WADL and it’s purpose to describe RESTful web applications.
That book was written in 2007, and at that time there weren’t many web applications using WADL.
I wonder if that has changed. How many web applications and which popular web applications are using WADL to describe it’s RESTful API?
If you do REST properly you really don’t need WADL. The API itself should be self-describing. The important thing to document is the media-types and link relations that you use.