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[p4-feedback] untyped rdf:Property vanishes

Bob Morris morris.bob at gmail.com
Tue Oct 13 17:49:08 PDT 2009


Why does P4 decline to render the resource foo in the RDF below?

<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" >
  <rdf:Description rdf:about="foo">
    <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#Property"/>
  </rdf:Description>
</rdf:RDF>

rather than saying it is not OWL.

But

<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
 xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
  <rdf:Description rdf:about="foo">
    <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#Property"/>
    <rdfs:isDefinedBy rdf:resource="bar"/>
  </rdf:Description>
</rdf:RDF>


results in the only(?) rendering possible (namely as an individual).

WonderWeb takes the same approach. Is there something in the OWL
formal semantics that would acount for this?

This arises in http://rs.tdwg.org/dwc/rdf/dwcterms.rdf  where the
modeler doesn't want mandatory datatyping, but wants to classify
properties with classes that are domain specific, so introduces his
own object property organizedInClass and adds assertions on the
untyped properties, e.g.
   scientificName organizedInClass Taxon
That model uses rdfs:isDefinedBy everythwhere(?)

Thanks
Bob Morris


-- 
Robert A. Morris
Professor of Computer Science (nominally retired)
UMASS-Boston
Associate, Harvard University Herberia
email: ram at cs.umb.edu
web: http://bdei.cs.umb.edu/
web: http://etaxonomy.org/FilteredPush
http://www.cs.umb.edu/~ram
phone (+1)617 287 6466



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