[dfdl-wg] CSV string worked example

Hi Folks, I have tried to work through the CSV example that Mike suggested a couple of weeks ago. It has turned up some interesting issues which I have tried to address. These are less about making the underlying semantics work and more about providing a seamless default set up that makes the easy things work just as you would like. I was pushed for time on this so I apologies if this is unclear in places, but I wanted to put it out before tomorrow's meeting. Thanks, Martin