Hi Jim,

> There are alternatives in between his "lazy" and "eager" models,
> some of which should be intuitive to the well trained practitioner
> of multi-generational concurrency control. [...]

Mrs. Kemme seems to have realised this too:
http://www.cs.mcgill.ca/~kemme/papers/icde05.pdf

> It has long been my opinion that there are two types of people, those
> two break all questions into a small number of categories, and those
> who think there are an infinite number of ideas, most of which
> haven't yet been thought.

???

Paul