>Ahh... Let me try to rephrase this to see if I understand.
>
>RI rules can not be business rules because that means the biz rules are making an assumption that the data is relational. An assumption that it should not be making.

No, the point is that some RI is business related, and some RI is technology related. The later belongs into the data tiee, while the rest is business logic.

Markus