Trygve Reenskaug <trygver at ifi.uio.no> wrote:
> ODMG (and Magma) seem to block application evolution by storing the binary 
> objects so that class definitions can't change. It will be difficult to use 
> them in critical applications if this is correct.
> 
> Cheers,
> --Trygve

This is not true AFAIK. GemStone/S for example handles multiple class
versions (at the same time) allowing lazy migration of instances. This
is AFAIK a much more advanced and flexible approach than RDBs offer.

And Magma seems to be following GemStone in this respect:

	http://minnow.cc.gatech.edu/squeak/5602

I think most OODBs have some form of schema/class evolution facilities.

regards, Göran