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[protege-discussion] Protege 3.4 OWL to RDF error

Manolis Platakis platakis at
Fri May 8 16:36:41 PDT 2009

Tania Tudorache wrote:
> I'm not sure why you get the exception.
> You should try either: File -> Export -> OWL  (with native and without 
> native writer).
> Or, you can choose, File -> Convert Project to Format -> RDF Files 

This is the choice that I made; sorry for not making it clear. I have an
OWL ontology and I only want to keep the RDF/RDF(S) data so I tried to
convert it to RDF Files and got the exception. A co-worker of mine faced
the same error with Protege 3.4 with a different ontology in a different PC.

Thanks Tania!


> (not OWL/RDF File). This will generate two files: rdf and rdfs. If you 
> only want one file, you can copy the content of one into the other.
> Tania
> Manolis Platakis wrote:
>> Hello,
>> I try to export an ontology to RDF in Protege 3.4 (Vista, JRE 6). I
>> choose convert project to format and I pick RDF. In the next window I
>> check the box "plain RDFS (may loose Protege-specific facets)" and click
>> OK. I end up with the following error:
>> Fatal error: java.lang.ClassCastException:
>> edu.stanford.smi.protegex.owl.model.impl.DefaultRDFSLiteral cannot be
>> cast to java.lang.String.
>> Is there any way that I could work around it? Thank you very much in
>> advance.
>> Best regards,
>> Manolis
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Manolis Platakis, Postgraduate Student & Research Associate
Department of Informatics and Telecommunications
National and Kapodistrian University of Athens

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