[Pellet-users] Errata corrige on: Individuals with anonymous ClassExpressions as rdf:type

[Evren Sirin]

Paolo,

It is certainly ok from Pellet's point of view to have anonymous class 
expressions in types. I'm not sure what you'd like to learn about how 
Pellet manages these expressions (they are normalized as every other 
expression that appears in other places). You can query for the 
instances, sub or super classes of these expressions, etc. But caching 
results for anonymous resources is less aggressive so in some cases you 
can get better performance if you define a named concept and set it 
equivalent to the expression, But doing so excessively will create many 
named concepts and eventually degrade performance. So there is a balance 
between two approaches which varies based on your application, typical 
queries you ask and so on.

Cheers,
Evren

On 4/28/08 7:30 AM, Paolo Bussotti wrote:
>  
> ----- Original Message -----
> *From:* Paolo Bussotti <mailto:paolo.bussotti at unifi.it>
> *To:* pellet-users at lists.owldl.com <mailto:pellet-users at lists.owldl.com>
> *Sent:* Thursday, April 24, 2008 6:00 PM
> *Subject:* [Pellet-users] Individuals with anonymous ClassExpressions 
> as rdf:type
>
> Hi everibody.
>  
> With reference to my previous mail  "Individuals with anonymous 
> ClassExpressions as rdf:type",
> I must apologize for asserting that when trying to programmatically 
> query individuals with a class expression as type I got unexpected 
> values. Mu query, indeed, did not fail, it was just a matter of 
> entailment in the open world assumption.   
>  
> However I still would like to know whether creating individuals with 
> class expression as type is a worthy practice or not, and , if 
> possible how, these anonymous expressions are managed by Pellet.
>  
> I thank you in advance,
> Best Regards
> Paolo Bussotti 
>    
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