It might not be very simple, but I certainly hope it does not necessarily imply SGML levels of cruft. The things you have covered don't need any of that cruft.

It might not be very simple, but I certainly hope it does not necessarily imply SGML levels of cruft. The things you have covered don't need any of that cruft. You are right that adoption is a major hurdle for any new solution, if it's even attainable, but that's pretty much my point. I'm sad that XML came to reach critical adoption for semi-structured data, and not something else.