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[protege-owl] Possible bug in SWRL for 3.4 beta b506

Martin O'Connor martin.oconnor at
Tue Oct 28 07:18:59 PDT 2008

rdfs:label is an RDF entity not an OWL entity so is not supported by  
SWRL. I plan to have a RDF built-in library soon to support the use of  
RDF entities queries.


Quoting Matsokis Aristeidis <aristeidis.matsokis at>:

> Dear all,
> I have the SWRL rule:
> Corrective_Maintenance(?x)  ?  rdfs:label(?x, ?y)  ?    
> swrlb:contains(?y, "a") ? sqwrl:select(?x)
> After upgrading to 3.4 Beta Build 506 on SWRL Jess tab when I press   
> the " OWL +SWRL-> Jess " button to translate the asserted facts to   
> OWL knowledge I get the following message:
> Exception importing SWRL rules and OWL knowledge:   
> edu.stanford.smi.protegex.owl.swrl.bridge.exceptions.OWLFactoryException:   
> empty property name in SWRLDatavaluedPropertyAtom 'rdfs:label(?x, ?y)'
> Thus, I can no longer translate the knowledge to OWL. The programme   
> was working well in build 126.
> Thank you very much in advance for your time.
> Best Regards,
> Aristeidis Matsokis

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