Though I would also be interested in this, I don't think
that such a thing exists. In fact, I believe that the purpose
of a workshop organized by Mike Schwartz and being held next
week in Boston is to (among other things) look into appropriate
standards/conventions for just this kind of functionality.
In any event, could people please respond to the whole list
as well as J.Y.K? I think this is of general interest.
PF