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Re: What is an RDF Query?

From: Sandro Hawke <sandro@w3.org>
Date: Tue Sep 11 08:45:52 2001
Message-Id: <200109111242.f8BCgrY02980@wadimousa.hawke.org>
To: pat hayes <phayes@ai.uwf.edu>
cc: www-rdf-rules@w3.org
> >I agree that RDF queries and RDF rule premises
> Er.....actually, rule consequents/conclusions are more like queries 
> than rule premises are. Is that what you meant?

Um, no.

Here's a rule:  If Ralph is in his office, then Ralph is at MIT.
                    \                  /         \           /
                     \                /           \         /
                          Premise                 Conclusion
                        (Antecedent)             (Consequent)

We could make either part into a query:
       Is Ralph in his office?
       Is Ralph at MIT?

But it seems much more natural to think of the premise as a query; it
leads us to a very simple algorithm:

      query: Is Ralph in his office?
      on success: we can conclude Ralph is at MIT.
      on failure: we can't conclude anything from this.

How else do you see it?

    -- sandro
Received on Tuesday, 11 September 2001 08:45:52 UTC

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