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[protege-owl] if SWRL rules make difference in reasoning process?

James Howison james at
Wed Oct 22 09:36:12 PDT 2008

I think, and I could be wrong, that the Pellet built into Protege 3.4  
does not reason with SWRL rules.  I think the only way to do this in  
Protege is via the SWRLJessTab.

Pellet outside of Protege 3.4, and, as far as I know, in Protege 4,  
does use the SWRL rules, at least a decidable set-set, with a reduced  
set of built-ins.


On 22 Oct 2008, at 12:15 PM, Przemek wrote:

> I am using Protege 3.4(built 506), along with the 'family' ontology.  
> The
> ontology has some SWRL rules defined, like:
> family:Person(?family:x)  ∧
> family:hasParent(?family:x, ?family:y)  ∧
> family:hasSister(?family:y, ?family:z)
>  → family:hasAunt(?family:x, ?family:z)
> and a few similar ones. By default, they are all ticked (enabled).
> Now, when I run the reasoner(Pellet), it inferres the following:
> DefaultOWLNamedClass(
> family.swrl.owl#Child)	Moved from family:Person to family:Relative
> DefaultOWLNamedClass(
> family.swrl.owl#Parent)	Moved from family:Person to family:Relative
> DefaultOWLNamedClass(
> family.swrl.owl#Sibling)	Moved from family:Person to family:Relative
> But, when I disable the SWRL rules, and run the reasoner again, the  
> output is
> completely the same.
> My questions are:
> Is it the reasoner's job to include these rules in reasoning  
> process? Or maybe,
> is there a button for executing them somewhere? Or do they not make  
> any
> difference?
> Am I missing something? :)
> Basicaly what I am trying to do, is to write a query which could  
> inferre
> somthing from defined assertions like:
> if (child(y) which hasFather(y,x) and fatherHasWife(x,z)) then  
> hasMom(y,z):
> [[hasFather(y,x) AND father(x) AND hasWife(x,z) AND wife(z)] =>  
> hasMother(y,z)]
> (or any other. this is just an example)
> I am sorry for asking such questions, but I am realy trying to  
> understand all
> this mechanism. So far, without any progress.
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