change attribute events

For a very long time now I have not been happy with attributes. On the one hand, they have been very dumb and on the other hand they can effect major changes. In COODBMS, only the admin was allowed to set attributes arbitrarily--the mechanism in place was completely unsafe.

So my thought is to create a change attribute even and send it to the appropriate element aspects, which can then raise an exception if there is a problem, so it can be secured and yet made available to users as a fast way to make changes to an element.

Again, events look like a great way for the aspects of an element to coordinate.