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[protege-owl] ClassCastException when loading ontology

Matthew Donaldson matthew_protege at datadeliverance.com
Sun Apr 8 17:03:43 PDT 2007


Many thanks for this, Timothy.  We have been in contact with the author of the 
ontology, so hopefully we should be get some explanations and/or fixes for 
these problems.

Cheers

                    -Matthew

Timothy Redmond wrote:
> A common recommendation in these cases is to validate the ontology  
> (http://phoebus.cs.man.ac.uk:9999/OWL/Validator).  A quick check   
> shows that this is a relatively pathological ontology.  Unfortunately  
> Protege has trouble with ontologies that have these constructs.
> 
> The main issue is that there are several objects in the ontology that  
> are both owl:ObjectProperties and owl:Class's.  So the first report is
> 
>> http://counterterror.mindswap.org/2005/ 
>> terrorism.owl#Organization_Founded used as Class and ObjectProperty
> 
> Here is the corresponding declaration in the ontology:
> 
>    <owl:Class rdf:about="#Organization_Founded">
>      <rdf:type rdf:resource="&owl;ObjectProperty"/>
> 	...
> 
> I suspect that this is a mistake.  But if it isn't I think that the  
> author should have a compelling reason for wanting to do this.  It  
> makes the ontology owl full and also doesn't appear to make a lot of  
> sense.  There are several instances of this problem.
> 
> There are also some other strange anomalies.  event_convicted_for  
> looks like it is an ObjectProperty because its range is the  
> intersection of TerrorAttacks, TerrorPlots and crimes (why is the  
> class "crime" in lower case unlike the other classes in this  
> ontology?). But event_convicted_for is declared as a DatatypeProperty.
> 
> The property  publicationdate is declared as an ObjectProperty even  
> though there is a nearby range declaration that suggests that it is a  
> DatatypeProperty:
> 
>    <owl:ObjectProperty rdf:about="#publicationdate"
>                        rdfs:label="Date of Publication">
>      <rdfs:domain rdf:resource="#Publications"/>
>      <rdfs:subPropertyOf rdf:resource="#date"/>
>    </owl:ObjectProperty>
> 
> 
> Also there is no reason to redefine rdfs:label and rdfs:comment.
> 
> The validator also finds a couple of other problems.  But there is  
> another problem for Protege that the validator does not turn up that  
> just looks gratuitous.  The declaration
> 
>    <owl:ObjectProperty rdf:about=""
>                        rdfs:label="Terrorism at en">
>      <rdf:type rdf:resource="&owl;Ontology"/>
>    </owl:ObjectProperty>
> 
> is defining something that is an instance of an owl:Ontology and an  
> owl:ObjectProperty.  It is hard to see why this is useful and this  
> will also break Protege.
> 
> -Timothy
> 
> 
> 
> 
> On Apr 7, 2007, at 6:14 AM, Matthew Donaldson wrote:
> 
>> Hi All,
>>
>> I'm trying to load a Terrorism ontology in OWL format
>> (http://www.mindswap.org/dav/ontologies/terrorism.owl) into Protege  
>> 3.3 beta,
>> and I'm getting several ClassCastExceptions.  The first relates to
>> DefaultOWLNamedClass.  I'm not sure what the best way is to narrow  
>> down the
>> problem from here.  Here's part of the stack trace:
>>
>> SEVERE: Error at loading file
>> file:/var/disk2/home/matthew/projects/Ontology/terrorism.owl --
>> java.lang.ClassCastException:
>> edu.stanford.smi.protegex.owl.model.impl.DefaultOWLNamedClass
>>          at
>> edu.stanford.smi.protegex.owl.model.triplestore.impl.RDFPropertyPostPr 
>> ocessor.<init>(Unknown
>>
>> Source)
>>          at
>> edu.stanford.smi.protegex.owl.model.triplestore.impl.TripleChangePostP 
>> rocessor.postProcess(Unknown
>>
>> Source)
>>          at
>> edu.stanford.smi.protegex.owl.model.triplestore.impl.AbstractTripleSto 
>> reModel.endTripleStoreChanges(Unknown
>>
>> Source)
>>          at
>> edu.stanford.smi.protegex.owl.jena.parser.ProtegeOWLParser.loadTriples 
>> (Unknown
>> Source)
>>          at
>> edu.stanford.smi.protegex.owl.jena.parser.ProtegeOWLParser.run 
>> (Unknown Source)
>>          at
>> edu.stanford.smi.protegex.owl.jena.parser.ProtegeOWLParser.run 
>> (Unknown Source)
>>          at
>> edu.stanford.smi.protegex.owl.jena.parser.ProtegeOWLParser.run 
>> (Unknown Source)
>>          at edu.stanford.smi.protegex.owl.jena.JenaOWLModel.load 
>> (Unknown Source)
>>          at edu.stanford.smi.protegex.owl.jena.JenaOWLModel.load 
>> (Unknown Source)
>>          at
>> edu.stanford.smi.protegex.owl.jena.JenaKnowledgeBaseFactory.loadKnowle 
>> dgeBase(Unknown
>>
>> Source)
>>          at edu.stanford.smi.protege.model.Project.loadDomainKB 
>> (Unknown Source)
>>          at
>> edu.stanford.smi.protege.model.Project.createDomainKnowledgeBase 
>> (Unknown Source)
>>          at
>> edu.stanford.smi.protegex.owl.jena.CreateOWLProjectFromFilePlugin.crea 
>> teProject(Unknown
>>
>> Source)
>>          at
>> edu.stanford.smi.protege.util.ProjectChooser.useCreateProjectFromFileP 
>> lugin(Unknown
>>
>> Source)
>>          at
>> edu.stanford.smi.protege.util.ProjectChooser.getProjectFromFile 
>> (Unknown Source)
>>          at edu.stanford.smi.protege.util.ProjectChooser.getProject 
>> (Unknown
>> Source)
>>          at
>> edu.stanford.smi.protege.ui.ProjectManager.getRequestedProject 
>> (Unknown Source)
>>          at
>> edu.stanford.smi.protege.ui.ProjectManager.openProjectRequest 
>> (Unknown Source)
>>
>>
>>
>> Thanks
>>
>>                    -Matthew
>>
>> -- 
>> +--------------------------------------------------------------------- 
>> -----+
>> | Matthew Donaldson             http:// 
>> www.datadeliverance.com             |
>> | Data Deliverance Pty. Ltd.    Email:  
>> matthew at datadeliverance.com         |
>> | 30 Musgrave Ave.              Phone: +61 8 8265 7976             
>> _        |
>> | Banksia Park                  Fax:   +61 8 8265 0032     John  /  
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| Matthew Donaldson             http://www.datadeliverance.com             |
| Data Deliverance Pty. Ltd.    Email: matthew at datadeliverance.com         |
| 30 Musgrave Ave.              Phone: +61 8 8265 7976            _        |
| Banksia Park                  Fax:   +61 8 8265 0032     John  / \/      |
| South Australia 5091                                     3:16  \_/\      |
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