Jim, this is a very good article and had me thinking about a lot of things that I read about in the physics realm. Every once in a while an author picks on one area and dives deep, without regard to a potential use… Your exposition here is clear and has the right amount of “coverage”. Well done. AND I have to admit that as I read your article I kept thinking to myself, “sounds like a data modeling exercise”. How many times have I had to consider inane elements in a model, just “because” or toyed with the idea that without use/structure, the only way I could model “that” is using a tag/value structure. Ugh.