Incremental development

When a new method is added to an ozone object, existing persistent =
instances
in the database no longer work.  If there a way of easily updating all =
the
instances in the database to the new class definition, or can this only =
be
done by keeping the old class definition too and create new instances of =
the
new class, copying the data over and deleting the old ones (or using XML =
or
ASCII export/import)?  With relational databases, it is relatively easy =
to
change table design without corrupting the data - can this be the case =
in
Ozone too (if I do something differently).

Thanks,
Aidan



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