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Posted to users@jena.apache.org by Fadhela Kerdjoudj <ke...@gmail.com> on 2013/06/12 15:18:40 UTC

problème with identification of intersection class

Hi,
I have a problem while testing if my class is an intersectionClass or not.
Let assume that my class is :

<owl:Class rdf:about="&gs;C">
        <owl:equivalentClass>
            <owl:Class>
                <owl:intersectionOf rdf:parseType="Collection">
                    <rdf:Description rdf:about="&foaf;Organization"/>
                    <owl:Restriction>
                        <owl:onProperty rdf:resource="&gs;isAgent"/>
                        <owl:allValuesFrom rdf:resource="&gs;ViolentAct"/>
                    </owl:Restriction>
                    <owl:Restriction>
                        <owl:onProperty rdf:resource="&gs;place"/>
                        <owl:allValuesFrom rdf:resource="&v;Address"/>
                    </owl:Restriction>
                </owl:intersectionOf>
            </owl:Class>
        </owl:equivalentClass>
    </owl:Class>

When I try to use it as an intersectionClass to recover operands, I have an
exception which indicate me that C is not an intersectionClass:
*Exception in thread "main" com.hp.hpl.jena.ontology.ConversionException:
Cannot convert node http://www.geolsemantics.com/onto#C to IntersectionClass
*

Do you have any idea of where the problem comes? cause I'm very blocked.

Best regards,
F.K.

Re: problème with identification of intersection class

Posted by Dave Reynolds <da...@gmail.com>.

On 12/06/13 14:18, Fadhela Kerdjoudj wrote:
> Hi,
> I have a problem while testing if my class is an intersectionClass or not.
> Let assume that my class is :
>
> <owl:Class rdf:about="&gs;C">
>          <owl:equivalentClass>
>              <owl:Class>
>                  <owl:intersectionOf rdf:parseType="Collection">
>                      <rdf:Description rdf:about="&foaf;Organization"/>
>                      <owl:Restriction>
>                          <owl:onProperty rdf:resource="&gs;isAgent"/>
>                          <owl:allValuesFrom rdf:resource="&gs;ViolentAct"/>
>                      </owl:Restriction>
>                      <owl:Restriction>
>                          <owl:onProperty rdf:resource="&gs;place"/>
>                          <owl:allValuesFrom rdf:resource="&v;Address"/>
>                      </owl:Restriction>
>                  </owl:intersectionOf>
>              </owl:Class>
>          </owl:equivalentClass>
>      </owl:Class>
>
> When I try to use it as an intersectionClass to recover operands, I have an
> exception which indicate me that C is not an intersectionClass:
> *Exception in thread "main" com.hp.hpl.jena.ontology.ConversionException:
> Cannot convert node http://www.geolsemantics.com/onto#C to IntersectionClass

 From the RDF point of view C is not the intersectionClass it is 
owl:equivalentClass to the intersection class.

Assuming no inference then use getEquivalentClass to get the anonymous 
intersection class and then use asIntersectionClass on that.

Dave