Brian,
Yes, that's right and I agree with your characterization of app/transport awareness as well.Some time ago we discussed whether a hierarchical view of the options is sufficient, and I know some of us (including me) concluded that it isn't, and that we really need a facet-based view. I think that hierarchies such as you have drawn tend to conceal similarities. But if you stick to hierarchies, I think you need at least one more, taking the view from the upper layerprotocols.
I do realize that the hierarchical models are very simplistic. Jari -- to unsubscribe send a message to rrg-request@psg.com with the word 'unsubscribe' in a single line as the message text body. archive: <http://psg.com/lists/rrg/> & ftp://psg.com/pub/lists/rrg