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[protege-discussion] Protege - OWL compatible software tool

Deepti Misra deepti64.misra at gmail.com
Mon Jul 14 19:31:29 PDT 2008


Dear Mr. Jonathan ,

Thanks for clearing the doubt.

I have moved further and created domain ontology . At present I am facing
following issues :

1)  I am not able to activate widgetgraph for my domain ontology using
protege . While
     I am able to see graph for newspaper case study . In newspaper graph
the drag and drop
     is not working

2)  Can I save documentation of entire my ontology with associated features
in pdf or doc
     file ?


Please help me .
With best regards,


Deepti




On Wed, Jul 9, 2008 at 3:27 PM, Jonathan Carter <
jonathan.carter at e-asolutions.com> wrote:

> Hi Deepti,
> On your first question, I think it's important to note that you are
> representing knowledge here and not building Java classes. Personally, I
> often find that I model my classes in a somewhat OO fashion, so the less
> specific things tend to be Abstract with 'leaf' classes as concrete.
> However, this isn't always the case and I think it depends on your domain as
> to what's important. So, in the example you mention, this reflects real
> life. I find a useful heuristic is to think about whether it makes sense to
> have instances of that class. So, yes, we want to have instances of Person,
> but we want to use Employee as a generalisation over the specific types of
> employee that a Person could be.
> In summary, I think the use of Abstract and Concrete classes is even more
> diverse than being in reverse to the normal OO approach. From a class model
> perspective, then can be used arbitrarily, it depends on how you need to
> work with the instances of your classes and the semantics that you wish to
> model.
>
> The second question, yes sounds like the right use of the inverse-slot. So
> you have 2 classes that you wish to be able to relate by using a slot of
> type Instance. On the Faculty class you add a slot that allows Instances of
> Student class (probably multiple cardinality) called, e.g. 'students' and
> you define an inverse slot on 'students'. You can have Protege create this
> inverse slot automatically - in which case it will create a slot on the
> Student class called 'inverse-of-students'. You can then rename this to
> something more meaningful, such as 'taught_by'. The nice thing about the
> inverse slot is that when you define the Faculty that a student is taught
> by, that Student instance appears in the 'students' slot of the selected
> Faculty instance - and vice versa.
> HOWEVER, a word of caution on the inverse slots. These are defined at the
> slot level between the slots, not the classes and Protege doesn't always do
> what you'd expect when you use inheritance with the classes. What it does
> allow you to do is to override the types of classes, for example, that are
> allowed in these slots in sub-classes. HOWEVER, I've recently found it
> important to understand that what you can't do is change or override the
> inverse slot at the sub-class. A slot can have only 1 inverse slot. This is
> worth considering when implementing your class inheritance hierarchy.
>
> Hope this helps
>
> Jonathan
> __________________________________________
> Jonathan Carter - Head of Technical Architecture
> Enterprise Architecture Solutions Ltd
> __________________________________________
>
> Assess your EA maturity at:
> www.enterprise-architecture.com/EAvaluator
> __________________________________________
>
> On 9 Jul 2008, at 10:28, Deepti Misra wrote:
>
>
>
>    Dear community
>
>   I am an engineering student working on my summer project and trying to
> understand and create   ontology using protege .
>
> Can anyone help me in understanding the following issues :
>
> 1)  NewsPAper example available with protege download indicates Employee
> class (Abstract) is subclass of Person(Concrete).  In my understanding
> superclasses are usually treated as Absract and more we more down
> (specialises), the abstraction reduces and concreteness increases. Here, it
> is in reverse order! Why it is so ?
>
> 2. I have two classes Faculty and Student in my project ontology. . Now,
> the relation....*Faculty* "teaches" *student* and *Student is* "taught-by"
> *faculty*. Is it 'right' application of inverse property ?
> How do I  input it using  Protege-editor ?
>
> Sorry for raising too trivial a query..
>
> Deepti
>
>
>
>
>
> On 7/9/08, Tania Tudorache <tudorache at stanford.edu> wrote:
>>
>> Berkan,
>>
>> Please ask Protege-OWL related questions on the protege-owl mailing list.
>>
>> Thanks!
>> Tania
>>
>>
>> berkan sesen wrote:
>> > Dear Community,
>> >
>> > I use many Universal and Existential restrictions in my ontology to
>> > specify constraints on various object properties:
>> >
>> > E.g. "ClassA" isRelatedto some "ClassB"
>> >
>> > Is it possible to use Racer/Java/Any tool to automatically infer from
>> > the restriction above that if I have an individual of "ClassA", it
>> > should have isRelatedto relationship with at least one "ClassB"
>> > individual?
>> >
>> > I am looking for a tool by which I can enforce this restriction
>> > without writing an explicit query (A tool that understands what
>> > Protege-OWL is talking about, indeed). Can Racer (or any other tool)
>> > "semantically" understand this axiom and do a consistency check on the
>> > individuals of the given classes?
>> >
>> > Any replies will be immensely appreciated.
>> >
>> > Thank you,
>> > Berkan Sesen
>> >
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