Dear All,
I was thinking about the usage scenario #3 that I drew on the whiteboard. It occurs to me that Jok, aka QL/Jgrok, from the folks at University of Waterloo is an analysis tool that is written in Java. It accepts TA, but not GXL. This might be worth looking at. http://swag.uwaterloo.ca/~nsynytskyy/QLDX/index.html
Susan