Eric posted some comments on the use of UML and MDA. This is the last paragraph of his post...

(And no, I don't think either UML or MDA is very well suited to using for Web services, either. Class diagrams are just not the right metaphor, since Web services are not object-oriented, and the interaction diagrams aren't rich enough. Never mind the fact it doesn't make sense to use diagrams to create software in the first place 😉

Now, if only some people, especially in the Grid community, could understand that Web Services ARE NOT distributed objects.