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[protege-discussion] big problem

Timothy Redmond tredmond at
Tue Nov 24 15:33:16 PST 2009

This is a confusing question, possibly partly because you are not  
using standard owl terms.  Reply with an owl ontology attached and we  
will probably get everything figured out.

> Hello,
> i have a big problem when i build my ontology, i have 2 instances  
> for 2 different classes

Already I am confused.  When you say instances, I think you might mean  
owl Individuals (members of owl classes).  But I am not sure what you  
mean by "for".  My suspicion is that what you are saying here is that  
you have two owl classes.  But you could be saying that you have two  
owl classes, A and B, and two owl individuals, i and j, one in each  
class (i in A, j in B).

> with the same name

If two individuals have the same name (rdf:id) then they are the same  
individual.  If two classes have the same name then they are the same  

> (instance has 2 types )

So this sounds like there is an owl individual, i, which is a member  
of two separate classes

> when i add a child to one of them

Except that individuals don't have children.

> (instance of sub class)

Makes no sense if instance is an owl Individual.

> i find it become a child to the 2 instances,

So it is possible that what you are saying is that you have a  
reference to a class, A, in two separate places.  Since both  
references to the class use the same name (rdf:id), they both are  
naming the same class.  You add a child (sub class) to that single  
class and both references to the same class show the same child.

Send the ontology and try asking the question again.


> that is can i distinct it to just one instance type.
> can any one help me, iam using Protege 4
> thanks
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