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Re: RDFS rule 0

From: Pat Hayes <phayes@ai.uwf.edu>
Date: Sun, 23 Sep 2001 23:00:33 -0500
Message-Id: <p05101025b7d454eed90a@[]>
To: jos.deroo.jd@belgium.agfa.com, Dan Connolly <connolly@w3.org>
Cc: w3c-rdfcore-wg@w3.org
Jos, you are basically right, thanks for catching it. I've found a 
patch (detailed below) and put up a version of the document with this 
fix  (and the fix to rule 9) at


Dan, can we can go to press with this version, or is it too late??


>It's late, but are we missing
>  -------------------------------------------------------
>| 0a | xxx aaa yyy.     | xxx rdf:type rdfs:Resource.   |
>  -------------------------------------------------------
>| 0b | xxx aaa yyy.     | aaa rdf:type rdfs:Resource.   |
>  -------------------------------------------------------
>| 0c | xxx aaa yyy.     | yyy rdf:type rdfs:Resource.   |
>  -------------------------------------------------------
>or not?

Hmm. I had thought that this was all derivable, but I see that maybe it is not.

0b is, I think:
1:  xxx aaa yyy.
2:  aaa type property . (1, rule 1)
3:  property type class . (2, rule 7)
4:  property subclass Resource (3, rule 8)
5:  aaa type Resource (2, 4, rule 11)

but one can do this for the others only if you can infer that they 
are in a class, and of course they may not be. If nothing is said 
about classes or the range and domain of aaa (which would provide 
another path using rules 5 and 6, then 7 etc., then as above) then I 
think the rules would be stuck.  Damn.

>If yes, that would mean that LV is a subset of IR

They would have to be stated like rule 9b, using 'uuu' to rule out 
the literal case for yyy, and then I think this would not be 
required. Ah, just noticed, rule 9a should be stated NOT using uuu. I 
will change that.


OK, heres my suggestion: expand rule 1 into 3 cases, like this:

xxx aaa yyy .    -->   xxx rdf:type rdfs:Resource .


xxx aaa yyy .   --->   aaa rdf:type rdf:Property .


xxx aaa uuu . ---> uuu rdf:type rdfs:Resource .

where 1b is the current rule 1 of course.

OK with you?

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Received on Monday, 24 September 2001 00:00:44 EDT

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