IBM dW posted Chime's and my tutorial: Python and XML development using 4Suite, Part 3: 4RDF. Requires free registration, but I think it's worth it :-)
In this third tutorial in a series on 4Suite, learn to use the 4RDF tool set and the various RDF facilities available with Python.
The OMG now links to my XML Europe presentation in their "Presentations and Papers" listing for MDA.