[protege-discussion] Protege 3.4 OWL to RDF error

[Tania Tudorache]

OK, I understand. I thought you are trying to convert a frames ontology 
to RDF. We have a different mailing list, protege-owl, for asking 
Protege-OWL questions.

Yes, that conversion never worked.

So, if you have an OWL file, it is already in RDF format :)

If you want to make it "pure" RDF, here are some steps that you can do:

- Project -> Configure -> Options -> Display Hidden Frames
- Project  -> Configure -> Enable the ClsesTab
- In the ClsesTab, select all top-level classes, right click and select 
from the context menu: "Change metaclass", then select rdfs:Class
- In the ClsesTab, select each top-level class, right click and select 
"Change Metaclass of Subclasses" and then OK.

There are also ways of doing this using a script in the Protege Script 
Console, or by writing a small Java program.

For the properties you would do the same. You should change their 
metaclass to rdf:Property.

Tania



Manolis Platakis wrote:
> 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!
>
> Manolis
>
>   
>> (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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>
>
>