Koen, I want you to think about such a concrete grammar and how a node+grammar would translate into plugin extension points. If we have a complete idea about this, we might consider going that way. But you need to know if and how it's going to work before we can think of starting coding it. The clue will be to see how such extension point would be integrated with all the other features of the designer such as: xml-to-model synchronization, undo, and so on. With your knowledge, it should be possible to oversee all these kinds of implications of such an approach before you would start to code it. Thinking about this is IMO much more important then any other feature. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4097164#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...