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Re: definitions of queries vs. rules

From: Peter F. Patel-Schneider <pfps@research.bell-labs.com>
Date: Fri, 07 Sep 2001 22:11:45 -0400
To: eric@w3.org
Cc: www-rdf-rules@w3.org
Message-Id: <20010907221145J.pfps@research.bell-labs.com>
I worry that there are things in queries that should not be in rules.
Consider DB query systems like (gasp) SQL.  Do we want all the baggage of
something like SQL in the antecedants of rules?  Do we even want everything
in a cleaner rule algebra in the antecedants of rules?

On the other hand, I applaud the limitation of the ``right-hand side'' of
rules to assertions.  I would worry a whole lot more if rules in
representational systems could perform arbitrary actions in their
``right-hand side''.

Peter Patel-Schneider



From: "Eric Prud'hommeaux" <eric@w3.org>
Subject: definitions of queries vs. rules
Date: Fri, 7 Sep 2001 14:11:42 -0400

> In the charter terms [1], I make the bold statement that rules are
> composed of queries and assertions. This is intended to clarify why
> both communities have been inducted into the same list. In
> implementing algae [2], I used the variables bindings from a query to
> compose assertions. Does this match the experience of others?
> 
> [1] http://lists.w3.org/Archives/Public/www-rdf-rules/#terms
> [2] http://www.w3.org/1999/02/26-modules/User/Algae-HOWTO
> -- 
> -eric
> 
> (eric@w3.org)
> Feel free to forward this message to any list for any purpose other than
> email address distribution.
> 
Received on Friday, 7 September 2001 22:13:45 GMT

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