[OWLAPI-developer] problem converting rdf to owl

[Jonathan P. <pan...@gm...>]

hi

i have the following problem:

i am trying to convert rdf files from dbpedia into an owl ontology
(example url: http://dbpedia.org/data/Pablo_Picasso.rdf)

right now i am doing it using the following code:

       public static void convert(OWLOntologyManager manager, OWLOntology
ontology, OWLOntologyFormat ontologyFormat, String savePath){
try{
File file = new File(savePath);
OWLOntologyFormat format = manager.getOntologyFormat(ontology);
if(ontologyFormat.isPrefixOWLOntologyFormat() &&
format.isPrefixOWLOntologyFormat()){
((PrefixOWLOntologyFormat)
ontologyFormat).copyPrefixesFrom(format.asPrefixOWLOntologyFormat());
//((PrefixOWLOntologyFormat) ontologyFormat).
}
manager.saveOntology(ontology, ontologyFormat, IRI.create(file.toURI()));
//manager.setOntologyFormat(ontology, ontologyFormat);
}catch(UnknownOWLOntologyException e){
System.out.println("Could not convert ontology: " + e.getMessage());
}catch (OWLOntologyStorageException e) {
System.out.println("Could not save ontology: " + e.getMessage());
}
}

however the following problem occurs:
some properties aren't converted correctly.

for example the rdf triple from example url:
<rdf:Description rdf:about="http://dbpedia.org/resource/Purvis_Young">
            <dbpedia-owl:influencedBy xmlns:dbpedia-owl="
http://dbpedia.org/ontology/" rdf:resource="
http://dbpedia.org/resource/Pablo_Picasso"/>
</rdf:Description>

is converted into:
AnnotationAssertion(<http://dbpedia.org/ontology/influencedBy> <
http://dbpedia.org/resource/Purvis_Young> <
http://dbpedia.org/resource/Pablo_Picasso>)

what makes me think that i am making something wrong is that if i use the
http://owl.cs.manchester.ac.uk/converter/ (which is down for the time
being, however i guess that in a couple of hours it will be online
again...) (which is using owlapi) it converts it into:
ObjectPropertyAssertion(<http://dbpedia.org/ontology/influencedBy> <
http://dbpedia.org/resource/Purvis_Young> <
http://dbpedia.org/resource/Pablo_Picasso>)
which is exactly what i want.

does anybody knows what i am doing wrong?

-- 
Panagiotidis Ionathan Giannis