> Garz,
> I am not quite clear about the question, and the distinctions you are
> making. Every subclass merely picks out of some parent class instances
> that have specific properties. So you cannot have in a subclass properties
> that are not also in the parent class, but you can *require* that the
> instances of the subclasses have a specific property, even if that property
> is not "mentioned" (i.e. not required) for every instance of the parent
> class.
>
> The term "intersection" is usually used to refer to an intersection of
> classes - the intersection is the class of entities, each of which is an
> instance of both parent classes. That intersection is a subclass of each of
> the parent classes. If you have a class of "RedThings" (anything that is
> red) and a class of "Wines" and you define a class of "RedWines" it could be
> a subclass of both RedThings and of "Wines", and would be the same as the
> intersection of "RedThings" and "Wines", unless you also add other
> restrictions to the "RedWines" class. [[ this is a bad example, because
> colors are too heterogeneous in application for "RedThings" to be a useful
> class]]. You seem to be using "intersection" in a different sense.
>
> Perhaps you could give a more specific example of what you would like to
> do.
>
> Pat
>
> Patrick Cassidy
> MICRA, Inc.
> 908-561-3416
> cell: 908-565-4053
>
cassidy@xxxxxxxxx>
>
>
>> -----Original Message-----
>> From:
ontolog-forum-bounces@xxxxxxxxxxxxxxxx [mailto:
ontolog-forum-
>>
bounces@xxxxxxxxxxxxxxxx] On Behalf Of garz
>> Sent: Friday, July 24, 2009 12:35 PM
>> To:
ontolog-forum@xxxxxxxxxxxxxxxx
>> Subject: [ontolog-forum] When to use pure subclassing and when to use
>> subclassing by intersecting
>>
>> Hi,
>>
>> i'm trying to create an ontology and there is a problem that i have in
>> understanding the difference between a pure subclass and a subclass
>> defined as intersection. my own explanation for this is the following:
>>
>> a subclass defined as intersection relates to the properties the
>> superclass has and constraints them. for example redwine constraints
>> the
>> property color of the superclass wine by constraining its value to red.
>> redwine is like an aspect or a view on a class, in this case on the
>> aspect color. or its like an alias picking a subset out of the related
>> superclass. a class defined that way introduces a new concept or term
>> by
>> just using the already existing, its not capable of creating new
>> content, so to speak.
>>
>> a pure subclass should then be used, if there is something new to it,
>> represented as a property that isnt mentioned in the superclass and the
>> subclass is free to introduce this property or not. if the property
>> already was in the superclass, a subclass defined by intersection would
>> be sufficient.
>>
>> am i correct with this thinking? i dont really get it. or is
>> intersection always applicable, but in this case i really dont
>> understand the sense behind it. plz enlighten me.
>>
>> regards
>>
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