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[protege-discussion] Problem in inferrencing
Soha Said
sohaelshafey at yahoo.com
Sun Sep 19 07:17:35 PDT 2010
Thanks so much. you got so closed
I do what you said.
now individual x has data property (name="Chris")
and individual y has data property (age=13)
after they are same the output must be
individual x: name="Chris" and age="13"
and individual y: name="Chris" and age="13"
but what happen not that
still each individual has his own data properties after inferencing
and I adjust preferences of reasoner. I don't know why?
--------------------------------------------------------
From: Timothy Redmond <tredmond at stanford.edu>
Maybe you are asking whether two individuals that are the same as each
other should have the same inferred object and data property values?
The answer is yes. What's more - this I wasn't clear on - this is
displayed naturally in the latest Protege. (I knew from previous
discussions that data property values can be difficult for a reasoner
to compute but I didn't entirely understand why this was so.)
I created the attached ontology. In the latest Protege 4.1, I selected
my reasoner (I tried both pellet and HermiT). I changed the reasoner
preferences (Reasoner->Configure->Displayed Inferences) to display both
object property assertions and data property assertions. Then in the
individuals tab I selected the class A and the individual j. It then
showed both the inferred data property and inferred object property that
was retrieved from the same individual i.
-Timothy
On 09/17/2010 10:25 AM, Timothy Redmond wrote:
> On 09/17/2010 10:05 AM, Soha Said wrote:
>> Hello,
>> I put some rule says that: if person x ,student y , y is copluar to
>> (some relation in my ontology) x, y is nsubj to (some relation in my
>> ontology) x then x same as y.
>> this rule when applied data properties and object properties must be
>> equaled of x and y.but what happened object properties are equaled
>> but data properties are not equaled. why?
>
> Again I have trouble understanding your question. The rule you
> describe is as follows:
>
> Person(x)
> Student(y)
> y copluar x
> x nsubj y
> ---------------
> x = y
>
>
>
> I am not sure if there are any SWRL constraints about the conclusion
> (x=y) but I will ignore that for the moment. There are not data
> properties in this rule. In this rule, x and y must be individuals so
> the properties, copluar and nsubj, must be object properties. I
> would have guessed that the x and y are the only variables in this
> rule so this rule only applies to people and students. It cannot be
> applied to data properties.
>
> -Timothy
>
>
>> Thanks in advance,
>> Soha Said
>>--------------------------------------------------------------------------------------------------------------------------------------
>>-
>> Subject: Re: [protege-discussion] Problem in inferrencing
>> Looking at this, it is hard to tell what you are trying to do. It
>> looks like you are asserting that
>>
>> all students are people
>> there is some person who is named Chris.
>> there is some student, possibly the same as the person above, who is a
>> graduate.
>>
>> Did I miss something? From this you want to conclude that the
>> students name is Chris? How does this follow?
>>
>> -Timothy
>>
>>
>> On Sep 15, 2010, at 11:44 PM, Soha Said wrote:
>>
>> > Hello,
>> >
>> > Thanks for your reply, but I do what you said and after reasoning
>> > the object properties are equal not data properties. Why?
>> > Thanks in advance,
>> > Soha Said.
>> >
>> > On Sep 15, 2010, at 9:54 AM, Soha Said wrote:
>> >
>> > > Hello,
>> > > I use prot?g? 4.1 beta. I build an ontology "Student" is subclass of
>> > > "Person".
>> > > If I create an instance from each two classes, then properties of
>> > > person instance inherited to student instance:
>> > >
>> > > If "Person_Instance_1":
>> > > Type: Person.
>> > > Name: Chris.
>> > >
>> > > And, "Student_Instance_1":
>> > > Type: Student.
>> > > Adjective: graduate.
>> > >
>> > > I want after inferencing, I can deduce that:
>> > >
>> > > "Student_Instance_1":
>> > > Type: Student.
>> > > Adjective: graduate.
>> > > Name: Chris.
>> > >
>> > >
>> > > How can I reach this result?
>> >
>> > The only way to reach this result is to assert somewhere that
>> >
>> > Person_Instance_1 sameAs Student_Instance_1
>> >
>> > You can't get the result you want with inference any other way. After
>> > all, there can be man instances of Person named "John", "Bill", etc.
>> > who are differentFrom Student_Instance_1. So you have to tell the
>> > system which instances refer to the same individual.
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