Re: [OWLAPI-developer] Accessing classes in a Hierarchy

[yalemisew A. <ya...@co...>]

Hi,
Thanks, It works fine with the reasoner!

On Wed, Jan 26, 2011 at 11:48 AM, Ignazio Palmisano <
ipa...@go...> wrote:

> 2011/1/26 yalemisew Abgaz <ya...@co...>:
>  > Hi,
> > I have faced a dificulty of accessing all the subclassses of the class
> > OWL:Thing using OWLAPI 3.1.
> > My code is as follows
> > ___________________________________________________
> > ...
> > OWLDataFactory factory= manager.getOWLDataFactory();
> > // Used to locate the OWL thing class from the ontology
> > OWLClass topClass= factory.getOWLThing();
> > findSubClass(topClass);
> > __________________________________
> >  public void  findSubClass()
> >     {
> >         Set x = null;
> >         classes= new OWLClass[100];
> >          for(OWLClass cls: currentOntology.getClassesInSignature())
> >          {
> >              System.out.println("\n the sub class of " + cls.toString()
> > +":");
> >              for (OWLClassExpression clsEx:
> > cls.getSubClasses(currentOntology))
> >                 System.out.println(clsEx.toString());
> >        }
> >     }
> > ____________________________________
> >
> > The above code displayes all the subclasses when I supply one of the
> classes
> > in my ontology. However it doesn't work for the OWL:Thing class. Is there
> > any other way I can do it?
>
> Hi, the reason it doesn't work as you expect is that the
> getSubClasses() method only looks for asserted subclass axioms. Many
> of your classes are not asserted to be subclasses of owl:Thing,
> although that can be entailed.
> You can find the root classes of your ontology, i.e., those classes
> which have no asserted superclass, and would therefore be the only
> direct subclasses of owl:Thing, by looking for those classes that are
> not subclasses of any other class; just loop through all classes in
> the ontology signature and ask the subclasses for each; remove them
> from (a copy of) the signature and when you're done with the loop the
> remaining classes are the root classes (not accounting for cycles).
> HTH,
> I.
>
> >
> > Regards
> > Yalemisew
> >
> >
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>
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