Thank you Dave for you corrections and the solutions you offered.
I have used the listStatements( null, EG.hasDataValue, (RDFNode)null)
and it works fine.
Kind Regards,
Eva
Στις 9/8/2011 7:52 PM, ο/η Dave Reynolds έγραψε:
On Thu, 2011-09-08 at 13:48 +0300, Evangelia Daskalaki wrote:
Dear all,
I have an OWL file which I read by using the jena API.
At the moment I read all the Classes ( model.listClasses() ) , the
Objectproperties (model.listObjectProperties() ) , the
Datatypeproperties (model.listDatatypeProperties() ) and the Individuals
(model.listIndividuals()).
[Probably just use of language but the "read" step is when you load the
data into your Model. All those list* API calls are then queries onto
that model, they aren't literally reading the file.]
But the OWL file contains also Individuals expressed in the form of
rdf:Description:
Example:
<rdf:Description rdf:about="#7700574884352544358">
<hasDataValue rdf:datatype="&xsd;string">Rachel Rath</hasDataValue>
</rdf:Description>
How can I read these individuals?
Depends what it is about those that identify them.
You could use:
listSubjectsWithProperty( EG.hasDataValue )
or (nearly equivalent)
listStatements( null, EG.hasDataValue, (RDFNode)null)
Alternatively if your ontology defines a domain for hasDataValue then
you could turn on inference (OWLMicro) and those would then become
identifiable as individuals.
Dave
