"david.lloyd(a)jboss.com" wrote : Why not do the same thing that has been done with names/descriptions - add a business key column for tokens/tasks/whatever, index it by default, but initialize it to null. This way if the user doesn't want to use it, they don't have to. I don't see it as a "mandatory or forbidden" kind of situation. again, this would be equivalient to marking one variable as being special, right ? also here my main point is in finding the set of use cases that could guide me in finding the right methods that need to be implemented for this. regards, tom. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4016450#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...