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[protege-owl] Lone individuals in RDF

Tania Tudorache tudorache at
Wed Jul 9 18:18:19 PDT 2008

Probably you did not assign it a type. It seems that in this case the 
individual is saved as a rdf:Description in the owl file, and the second 
time you open the file, it will not show up in the individuals tab.

I suggest that you post the question on the p4feedback list, which is 
the list for Protege 4 related questions:


Charles Crichton wrote:
> Hi,
> I am wondering about how lone individuals are treated in Protege alpha 
> build 64, and in RDF in general?
> Is the following a bug or a feature?
> 1) Start Protege (4.0 alpha Build 64), and "Create new OWL ontology".
> 2) Go to the Individuals tab and create a new individual. Call it 
> "Singleton", the name is unimportant.
> 3) Save the file using the RDF/XML format.
> 4) Quit Protege.
> 5) Inspect the saved file to see that the individual "Singleton" has 
> been saved.
> 6) Open Protege and "Open OWL Ontology" and select the newly saved file.
> 7) Go back to the Individuals tab. Where has the individual 
> "Singleton" gone?
> I have tried repeating this for the other save formats and the 
> individual also seems to disappear on loading.
> I realise that RDF is all about triples, and therefore the RDF 
> generated into the file in the above example might be the problem 
> rather than the loader? Or are individuals allowed to exist on their 
> own in RDF?
> :)
> Charles Crichton
> Oxford University Computing Laboratory
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