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I have created a basic Class hierarchy for my ontology in Protege-OWL Editor version 4.1. But I am not able to visualise Object Properties and relations between the classes in OwlViz other than the normal hierarchy or "is-a" relationship. So please tell me how to display "object properties" using OwlViz or OntoGraf ? or do I need to make some modifications in corresponding owl/xml file ?
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If after launching Protege you do not see the OntoGraf tab, enable it by going to Window | Tabs, and select OntoGraf from the list of available tabs.
Open Protege and go to the File/Preferences menu option. Once open, go to the OWLViz tab. e. Select the "OK" button.
Protégé fully supports the latest OWL 2 Web Ontology Language and RDF specifications from the World Wide Web Consortium.
No, modifications will not help you. Object properties in OWL do not hold between classes but only between instances. For example, it is not possible to have a relation between Government and Embassy in (the decidable fragment of) OWL, but only between their instances. If Government has "USGovernment" as instance and Embassy "USEmbassyInEthiopia", you can assert that a relation (maybe embassy-of) holds between both. Between classes, you can assert axioms. For example, you can state that all embassies must be an embassy-of some Government (Embassy SubClassOf: embassy-of some Government). If you are interested in visualizing these relations, you may want to look at some graph-based ontology development tools such as OBOEdit.
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