Re: [OWLAPI-developer] How to define class assertions

[Jayan <jay...@gm...>]

if your question is to declare an object property and associate individuals
with it, then you may try the following way.
//declare classes
OWLClass class1=factory.getOWLClass(URI.create(<uri of your class1>))
OWLClass class2=factory.getOWLClass(URI.create(<uri of your class2>))

//declare individuals
OWLIndividual ind1=factory.getOWLIndividual(URI.create(<uri of your
individual1))
OWLIndividual ind2=factory.getOWLIndividual(URI.create(uri of your
individual 2));

//declare object property
OWLObjectProperty obp=factory.getOWLObjectProperty(URI.create(uri of your
object property));

//  now make the individual instance of the class

 OWLClassAssertionAxiom
assertion1=factory.getOWLClassAssertionAxiom(ind1,class1);
 AddAxiom addAxiomChange1=new AddAxiom(ont,assertion1);// ont is the
ontology uri
 manager.applyChange(addAxiomChange1);

// similarly the other individual

 //domain and range for property
  OWLObjectPropertyDomainAxiom
dom_asser1=factory.getOWLObjectPropertyDomainAxiom(obp,class1);
OWLObjectPropertyRangeAxiom
ran_asser1=factory.getOWLObjectPropertyRangeAxiom(obp,class2);
                AddAxiom addAxiomChange2=new AddAxiom(ont,dom_asser1);
                manager.applyChange(addAxiomChange2);
                AddAxiom addAxiomChange3=new AddAxiom(ont,ran_asser1);
                manager.applyChange(addAxiomChange3);


       // now relate the individuals with the property

OWLObjectPropertyAssertionAxiom assertion4 =
factory.getOWLObjectPropertyAssertionAxiom(ind1,obp,ind2);
AddAxiom addAxiomChange2=new AddAxiom(ont,assertion4);
                manager.applyChange(addAxiomChange4);


hope it helps...have fun with OWL API

On Wed, May 27, 2009 at 10:02 PM, Babak Tourani <ba...@ya...> wrote:

> Hi,
>
> I'm a newbie to OWL-API.
>
> I have gone through examples in owl-api documentations and I have no
> problem defining triples on "Individuals" (e.g. example4). But I need to
> define phrases such as "newPizza hasTopping some MozzarellaTopping" and
> (obviously) I can not use OWLObjectPropertyAssertionAxiom interface, since
> the first parameter of the associated method is an "Individual" not a class.
>
> What should I do?
>
> Thanks.
> Babak Tourani
> MSc student
> University of Westminster
>
>
>
>
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-- 
Jayan K