|From:||"Adrian Walker" <adriandwalker@xxxxxxxxx>|
|Date:||Sun, 11 May 2008 12:35:44 -0400|
Hi John --|
Thanks for your quick answer.
I think that we should be careful to distinguish between two entirely different languages:
(1) Datalog (it has no negation at all)
(2) Datalog augmented with Negation as Failure
Let's see what Pat has to say about whether the model theory semantics of (2) is compatible with the model theory semantics of FOL.
I suspect that the answer is "No". If so, there are many ramifications, since (2) matches the way relational databases are used in practice. It's also the way negation is treated in the Internet Business Logic system, and in the SQL that the system generates and runs automatically.
Cheers, -- Adrian
Internet Business Logic
A Wiki and SOA Endpoint for Executable Open Vocabulary English over SQL
Online at www.reengineeringllc.com Shared use is free
On Sun, May 11, 2008 at 11:43 AM, John F. Sowa <sowa@xxxxxxxxxxx> wrote:
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