easy question about Rules proposal

From: David Martin (martin@ai.sri.com)
Date: 11/11/03

  • Next message: Peter F. Patel-Schneider: "Re: easy question about Rules proposal" 
    Folks (esp. Ian and Peter) -

I have a question about the Ian/Peter Rules Language proposal, which is 
minor but important in the sense that I want to get some examples right 
in something I'm writing.

Why in the following example (and I think all the examples in
   http://www.cs.man.ac.uk/~horrocks/DAML/Rules/)
is "owlx:name" used, both at point of definition and point of reference, 
instead of using rdf:ID and rdf:resource?

<owlx:Rule>
   <owlx:antecedent>
     <owlx:individualPropertyAtom  owlx:property="hasParent">
       <owlx:Variable owlx:name="x1" />
       <owlx:Variable owlx:name="x2" />
     </owlx:individualPropertyAtom>
     <owlx:individualPropertyAtom  owlx:property="hasBrother">
       <owlx:Variable owlx:name="x2" />
       <owlx:Variable owlx:name="x3" />
     </owlx:individualPropertyAtom>
   </owlx:antecedent>
   <owlx:consequent>
     <owlx:individualPropertyAtom  owlx:property="hasUncle">
       <owlx:Variable owlx:name="x1" />
       <owlx:Variable owlx:name="x3" />
     </owlx:individualPropertyAtom>
   </owlx:consequent>
</owlx:Rule>

Thanks,
David

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