Understood, thank you. How much space is available in the metadata byte fields? I can't see the likes of banks or financial institutions wanting to use it if they can't do everything in a single atomic transaction, unless you have a cunning 2 phase commit option/strategy with Oracle/DB2 etc.

Just want to say that I'm not trying to be negative - you're a long way down the dev road, and must have thought about all of this, so I want to read about it! :-)