I think that was a very interesting
discussion! We do have some examples from traditional modeling
world. ( class room kind of examples..)
For example, A Supervisor is an employee
himself, and he has staff ( group of employees ) working for
him! Which creates a one to many relationship !
MW: I’m afraid that really is only a class-room
example. In the real l world, the employees and supervisors come and go, so
it is really a many-to-many relationship, and arguably more complex even than
A meetup of Meetups has similar modeling notations..
About your previous slides.. and the exmaples of
At a conceptual level ( Ontology) I would
just have a superclass, a class of "Furniture"
with subclass as Tables, Chairs,
upholstry and the rest in the list.. and relationships..
MW: Upholstery is not a class of furniture. It is only a part
of a piece of furniture.
As one can see, Class "Furniture" can be
generic and standardazised with a set of generic subclasses and generic
relationhips.. if one does not include the exceptions, at
this level, I would find that acceptable. it can be done at a detail
level.. as long as superclass covers all.. However, if one
finds the exceptions or the special types ear;y, then can include as
notes with explanation, it would help at a detail level.
MW: If there are exceptions, then you have just done something
At a detail design level - which is logical
and physical, I would include further details and exceptional or special
types etc.. But at a detail level of design, if this step
is overlooked, it causes either design flaws or difficult coding to
cover it up. ( its just bad design..)
MW: I’m sorry, I don’t follow this. Specific product
models may be subtypes of generic product types.
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--- On Wed, 10/28/09, Matthew West <dr.matthew.west@xxxxxxxxx>
From: Matthew West <dr.matthew.west@xxxxxxxxx>
Subject: Re: [ontolog-forum] Ontology modules and namespaces
To: "'[ontolog-forum] '" <ontolog-forum@xxxxxxxxxxxxxxxx>
Date: Wednesday, October 28, 2009, 4:27 AM