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extra axiom?

From: <jos.deroo.jd@belgium.agfa.com>
Date: Mon, 24 Sep 2001 22:25:07 +0100
To: timbl@w3.org
Cc: www-archive@w3.org
Message-Id: <41256AD1.0075A8A7.00@ambem5.eps.agfa.be>
Tim,

I came across http://ilrt.org/discovery/chatlogs/rdfig/2001-09-24.html
and found
[[
  [03:14:20] tim
  So I am left wondering whether to build
  this log:forAll :x. {} log:implies { :x a rdf:Resource }.
                                               ^s
  into cwm so that I can use Jos's rules directly -- or is
  the whole idea that you have to turn on each rule - you have
  control of them. I didn't notice this axiom in his list.
]]

I see that adding that rule doesn't help CWM to infer
more, and that Euler has a parser problem
while I thought that I fixed that {} :-(
Adding
->
  { :s :p :o } log:implies { :s a rdfs:Resource }.

is better, and CWM now thinks
->
    rdfs:Resource     a rdfs:Class,
                rdfs:Resource .

    rdfs:domain     a rdfs:ConstraintResource,
                rdfs:Resource .

    rdfs:range     a rdfs:ConstraintResource,
                rdfs:Resource .

however is see that it is not finding
->
    rdfs:ConstraintResource a rdfs:Class.

whereas Euler thinks it is
->
   {:RULE7 a rdfs:Resource.
    rdfs:domain a rdfs:ConstraintResource} log:implies
  {rdfs:ConstraintResource a rdfs:Class}.

   {:RULE7 a rdfs:Resource.
    rdfs:range a rdfs:ConstraintResource} log:implies
  {rdfs:ConstraintResource a rdfs:Class}.

We actually have that rule built in (and also the one
to infer wether a thing is a rdf:Property) because we
could,t find a way to do that in a back-chaining way...
There was not an "idea that you have to turn on each rule"
but that could be interesting :-)

--
Jos De Roo, AGFA http://www.agfa.com/w3c/jdroo/
Received on Monday, 24 September 2001 16:25:30 GMT

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