[Pellet-users] class type query

[Evren Sirin]

On 2/21/08 12:50 PM, abdelhak attou wrote:
>
>
> Thx Evren
>  
> if i create a class , then without adding it to the ontology  i query 
> for its super classes, will the reasoner have to reclassify the ontology ?

No, it will just classify that concept (i.e. find its position in the 
class hierarchy). Adding the concept and then querying for superclasses 
would trigger classification.

Cheers,
Evren
>  
>  
> Many thanks
>  
> Attou
> ------------------------------------------------------------------------
>
> > Date: Thu, 21 Feb 2008 12:38:02 -0500
> > From: evren at clarkparsia.com
> > To: attou_ab at hotmail.com
> > CC: pellet-users at lists.owldl.com
> > Subject: Re: [Pellet-users] class type query
> >
> > On 2/21/08 11:08 AM, abdelhak attou wrote:
> > >
> > >
> > >
> > > Hi ,
> > >
> > >
> > > 1. if i have an ontology, can i define a class using the ontology
> > > api (for example OWL-API) and query for its types according to the
> > > ontology without having to add it to the ontology.
> > >
> >
> > Yes, you can do it. Just create the class using the data factory and
> > pass it to the reasoner.getIndividuals function. There is a bug in
> > Pellet 1.5.1 where such instance retrieval operations are slow if the
> > ontology is not previously classified so you can classify the ontology
> > upfront only once and then retrieve instances for classes as many times
> > as you like.
> >
> > >
> > > 2. If i have to add the class first , will pellet reclassify the
> > > whole ontology or just necessary parts according to some
> > > incremental reasoning algorithm
> > >
> >
> > Depending on what kind of change it is (addition of a new class,
> > addition of a type assertion on existing individual and class, etc.)
> > classification can be repeated. Currently there is no incrmental
> > classification support in Pellet 1.5.1 but there is some preliminary
> > incremental reasoning support for ABox changes.
> > >
> > >
> > >
> > > 3. if no such algorithm is supported, is it planned for future
> > > pellet versions ?
> > >
> >
> > In the next version of Pellet there will be incremental classification
> > support, too.
> >
> > Cheers,
> > Evren
> > >
> > >
> > > thx !
> > >
> > >
> > > attou
> > >
> > > 
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