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[protege-discussion] OWL2 Classes
robert.stevens at manchester.ac.uk
Sat Mar 17 02:10:47 PDT 2012
it seems that you are describing SKOS - the W3C's Simple Knowledge Organisation System. SKOS itself is (sort of) a vocabulary in OWL2. SKOS has, without too much inspection, most of what you lay out below. There is an Editor plugin for Protege called SKOSED.
SKOS has a class "concept" and individuals of that class are the vocabulary's terms. SKOS comes with bt, nt, and rt properties, as well as notions of concept scheme and so on. You can also use all of OWL 2 within it (including the reasoning which is v interesting - at a trivial level, it wil put in all your inverses for you wihout you having to do it...)
do say if it meets your needs - I'd be interested.
----- Original Message -----
From: Jim Tivy
To: 'User support for Core Protege and the Protege-Frames editor'
Sent: Saturday, March 17, 2012 1:07 AM
Subject: Re: [protege-discussion] OWL2 Classes
Thanks for laying out the OWL2 formalisms. I think OWL2 is a great data modelling system.
I only need to manipulate the data structure in a few ways and I am happy to write those by hand. I would like to discuss data modelling first, then discuss reasoning (or rather agree not to discuss reasoning as right now reasoning does not seem interesting).
What I want to do is represent a Thesaurus which is a common well defined structure that is described many places including here: http://www.willpowerinfo.co.uk/thesprin.htm
In English (not in OWL2) I think of it this way:
There is a class of objects called Terms, some of which are in a hierarchy some of which are not. Each Term needs to have the following properties:
- Scope Node
- Broad Term
- Narrow Term
- Related Terms
My thought is to model this in OWL2 (excuse my paraphrase of OWL FL) as:
Declare Class Term
Declare Property(HasChild) // to subsume BroadTerm and NarrowTerm are
And so on.
Is that enough information?
From: protege-discussion-bounces at lists.stanford.edu [mailto:protege-discussion-bounces at lists.stanford.edu] On Behalf Of Timothy Redmond
Sent: March-16-12 5:13 PM
To: protege-discussion at lists.stanford.edu
Subject: Re: [protege-discussion] OWL2 Classes
On 3/16/12 1:22 PM, Jim Tivy wrote:
I am looking to implement a Thesaurus using the OWL2 model. It seems the recommended OWL2 modelling is to use a class for each term.. When I look at class, however, it seems that it is very weak because the mechanism for attaching properties to classes is weak.
Actually I think that the OWL 2 formalism is very expressive. The thing that you have to figure out is exactly what you mean by "attaching properties to a class". So if you have a class, A, a class B and a property p you can say
a.. all individuals in the class A must have a p-property value:
A SubClassOf p some Thinga.. all individuals in the class A must have a p-property value that is in the class B:
A SubClassOf p some Ba.. if some individual, i, has a p-property value then the individual i must be an element of the class A:
p domain A
This is only just barely scratching the surface. So tell us what you are trying to express and we can start thinking about whether OWL 2 can express it.
I think I am better served to have one class called "Terms" or "Concepts" whose individuals express the Thesaurus. In that way I can constrain properties and reason about these individuals more naturally.
It may be that this is true but it seems very unlikely to me. My sense is that if you don't have a rich class structure then you are not going to have much to reason about with the individuals.
I realize Class==Concept in OWL2, however I think that since Class itself is not an individual that it is too weak. What ever happened to the notion of the Class Class.
What is the "Class Class"? If you are thinking of meta-modeling, then my reaction is that I think that realistic meta-modeling is probably often quite difficult to get right. But in any case, the starting point is to figure out what you are trying to say. Then we can figure out what language capabilities you need to express your concept.
Jim Tivy - CTO, Bluestream
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