I saw this go by on the xml-dev list this morning and my first thought was "boy, there would be a way to make the sitemap even harder to work with". After looking at it closer I'm not sure exactly how you could make a sitemap with this combination, though from the description one would think it should fit the bill of combining the sitemap and flow exactly.
In any case, have a look at: http://www2004.org/proceedings/docs/2p340.pdf For a description of the "XJ" language. (A solution looking for a problem?) Peter Hunsberger
