For a week now, I have been working on Apache Cocoon. It is quite an old web framework and much support is not on the net.
After spending hours for documentation, I managed to grab the below documents and uploaded it on my server for downloads.
These files are Cocoon documentation which include Cocoon forms.
Web Application with Apache Cocoon, the easy way – Carsten Ziegeler
Advanced Cocoon Forms – Sylvain Wallez
Taming Cocoon – ApacheCon Europe 2005 Gianugo Rabellino
Hope these documents are helpful to the readers!