Tom,

> Am I correct if I understood it: 'A new modern approach to
> relational mapping is using one field (preferable generated) as the
> primary key?

Yes. The key point is that if this field does not carry *any* business
information, you aren't going to have trouble when the business rules
change.
In other words, primary keys should have absolutely no business meaning.
Ciao
--
____
_/\/ando