A CMS is usually a "Content Management System", but apart from that the definition varies. One part of a CMS is often the presentation system - and that could perhaps be Cocoon. There are a number of CMS built using Cocoon, including Lenya (fka Wyona).
Question: Which are the other CMS?
Question: I suppose there are some contradictory technologies (CMS using Struts or CMS using Cocoon)??