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Re: Property with no range ... ObjectProperty or DatatypeProperty?

From: pat hayes <phayes@ai.uwf.edu>
Date: Tue, 4 Mar 2003 12:23:31 -0500
Message-Id: <p05111b07ba8a90cf008e@[64.134.139.17]>
To: Leo Obrst <lobrst@mitre.org>
Cc: "Roger L. Costello" <costello@mitre.org>, www-webont-wg@w3.org

>For the second case, OWL DL/Lite, is it true that you can't make it? Or that
>it would be defined as rdf:Property, but that the latter's subclasses (owl:
>DataatypeProperty and owl: ObjectProperty) are disjoint, hence could cause
>real problems?
>
>If you had such a definition, i.e., defined to be rdf:Property, in an
>ontology, would that automatically push you into OWL FULL?

The answer to that question depends on fine details of decisions 
currently being taken (I am sitting in the very meeting as I type) 
about exactly how OWL-DL/RDF syntax is going to be defined. Do not 
expect the answer to be simple or easy to understand.

Pat Hayes

>Leo
>
>Dan Connolly wrote:
>
>>  On Sun, 2003-03-02 at 07:02, Roger L. Costello wrote:
>>  > Hi Folks,
>>  >
>>  > Suppose that I want to define a property without an rdfs:range.  Thus,
>>  > the property can have any value - a string (datatype) value or an object
>>  > value.  Right?
>>
>>  In OWL Full, yes...
>>
>>  >   Then how do I define the property - as an
>>  > owl:ObjectProperty or as an owl:DatatypeProperty?
>>
>>  neither. owl:ObjectProperty excludes string values,
>>  and owl:DatatypeProperty excludes non-datatype values.
>>
>>  So you can't make an OWL DL/Lite ontology with
>  > such a beast.
>>
>>  In OWL Full, it's just an ordinary rdf:Property.
>>
>>  >   /Roger
>>  --
>>  Dan Connolly, W3C http://www.w3.org/People/Connolly/
>
>--
>_____________________________________________
>Dr. Leo Obrst  The MITRE Corporation
>mailto:lobrst@mitre.org Intelligent Information Management/Exploitation
>Voice: 703-883-6770 7515 Colshire Drive, M/S H305
>Fax: 703-883-1379       McLean, VA 22102-7508, USA


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Received on Tuesday, 4 March 2003 12:23:36 GMT

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