MDA and the semantic web...

Dear all,
I do appreciate that this may be something that has already been
discussed in the news group...
 
Yet, I have been talking to someone about the future of computing and
MDA's (model design architectures) came up along side the semantic web
but not combined.
 
Obviously, we are all looking at MDA's from the work-flow point of view,
i.e. petri-nets for work-flows.  Also, mediation is feasible...
graphically joining items up and placing axioms on the joins.
 
Has anyone looked at using MDA's for other parts of the UI for semantic
services?  Apart from petri-nets are there any other meaningful MDA's
available/applicable?  Aside from using a separate tool for producing
executable UML, is this a reasonable thing to consider?
 
I would appreciate any guidance on this and a point in the right
direction, or some good news in that all this has already been discussed
and the results,
regards,
Sam J Watkins

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