rule 2 should of course read
"A suspended customer may /not/ place any orders"
Scott Finnie wrote:
Apologies if this has been covered somewhere, couldn't find it in the
I'm wondering about ability / sensibility of above. For example, say I
want to model the following rules:
1. A customer must be suspended if they default on a payment
2. A suspended customer may place any orders
Now the first one I can readily map to the when/then format of
production rules. But I can't see how to elegantly represent the second
one - at least not in a transactionally clean manner. I could write:
c: Customer (status == "suspended")
o: Order ( customer == c)
But that's not really what I want to achieve. Rather, I'd like the
check enforced before the order was created, not after.
Or maybe I'm just thinking wrong? Main influence is RDBMS, where I'd
write a trigger that would stop the transaction completing if violated.
Hope that makes sense, and thanks in advance.
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