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[protege-discussion] Dublin core annotation of OWL classes: howTo?

Tania Tudorache tudorache at stanford.edu
Tue Feb 27 16:37:54 PST 2007


Fabrizio,

Please post OWL related questions on the OWL mailing list.

Thanks,
Tania


Fabrizio wrote:
>
> Hi all,
> I'm trying to add a dc annotation property to a class contained in a
> JenaOWLModel, using the Protege API. I would like to obtain something like
>
> -------------------------------------------------------------------------
>
> <owl:Class rdf:ID="Idaho">
>     <rdfs:subClassOf>
>       <owl:Class rdf:about="United_States"/>
>     </rdfs:subClassOf>
>     <dc:identifier>375903</dc:identifier>
> </owl:Class>
>
> -------------------------------------------------------------------------
>
> where "dc:identifier" contains a unique value for the class.
>
> The JAVA code I thought could work is:
>         
> OWLModel dublinCoreModel = OwlProtegeIo.openOWLFile("dublincore.owl");
>
> Iterator it;
>
> Collection dcAnnotationProperties = dublinCoreModel.getOWLAnnotationProperties();
>
> it = dcAnnotationProperties.iterator();
>
> while (it.hasNext()) {
>     dcAnnotation = (RDFProperty) it.next();
>     if ((dcAnnotation.getName()).equals("identifier"))
>        break;
> }
>
> idahoNamedClass.addPropertyValue(dcAnnotation, "375903");
>
>
> Unfortunately it doesn't seem to work 'cause the result is:
>
> -------------------------------------------------------------------------
>
> <owl:Class rdf:ID="Idaho">
>     <rdfs:subClassOf>
>       <owl:Class rdf:about="United_States"/>
>     </rdfs:subClassOf>
>     <dc:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string"
>     >375903</dc:identifier>
>   </owl:Class>
>
> -------------------------------------------------------------------------
>
> Another problem is that after having saved the model in a owl file, when I
> reopen it I would like to access the annotation property "dc:identifier" and its
> value but neither:
>
> Object annotationValue = idahoNamedClass.getPropertyValue(dcAnnotation);
>
> nor:
>
> Collection annotationProperties = idahoNamedClass.getRDFProperties();
>
> seem to help me, cause the property isn't accessible/visible using these methods.
> Has someone had the same problem? Is there an easier way to insert dc
> annotations in a OWLModel?
>
> Thanks.
> Fabrizio
>
>
>
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