W3C home > Mailing lists > Public > www-rdf-interest@w3.org > October 2003

Examples of OWL used for datatype inferencing?

From: Graham Klyne <gk@ninebynine.org>
Date: Thu, 30 Oct 2003 08:21:40 +0000
Message-Id: <>
To: www-rdf-interest@w3.org

Does anyone have any examples of using OWL to perform RDF-datatype-related 

I'm thinking of datatypes, such as numbers, for which additional properties 
are used to define additional relations, such as addition over numbers.

For example, given:

    :vehicle :seatedCapacity "30"^^xsd:integer .
    :vehicle :standingCapacity "10"^^xsd:integer .

and knowledge that the total capacity is seated capacity + standing 
capacity, that one might infer:

    :vehicle :totalCapacity "40"^^xsd:integer .

This might be expressed thus using CWM-style rules:

    { ?v :seatedCapacity ?c1 .
      ?v :standingCapacity ?c2 .
      (?c1 ?c2) math:sum ?c3 . }
    { ?v :totalCapacity ?c3 . }

It seems to me that to express such relations one must have a form of 
universal quantification.  But I'm not sure if anything in OWL performs 
such a purpose, so I struggle to see how one might express an idea like 
that above.

Behind this question, I'm trying to see if there's a way to abstract the 
rules of datatype properties away from particular application 
domain.  (i.e. using just RDF statements, and not rules, to express ideas 
like the example above, appealing only to application-independent rules 
defined on datatyped values.)  Currently I'm not seeing any way to do this, 
but before I give up I wanted to see how OWL (as the major thrust for Sweb 
inference) deals with such issues.


Graham Klyne
For email:
Received on Thursday, 30 October 2003 03:31:46 UTC

This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 22:44:45 UTC