Re: class-specific inverse

> Hi,
>
> On 1 jun 2009, at 16:44, Lee Feigenbaum wrote:
>>> But, if you have
>>> Springer publishes  YourBook and YourBook is an instance of Book,
>>> then this does *not* entail  Springer publishesBook  YourBook
>>
>> ...But this is the part I'm asking how to do :-)
>
> You can do this using complex role inclusion axioms (role chains) and
> marker properties [1]:
>
> - add an object property 'isBook'
> - put a self restriction on isBook on Book: Book subClassOf isBook some
> self
> - add a role chain definition to publishesBook: publishes o isBook ->
> publishesBook
> - (publishesBook does not have to be a subproperty of publishes)
>
> What happens is that any individual of type Book (e.g. YourBook) will
> 'get' an isBook relation with itself. Given a publisher individual
> (Springer) that has a publishes relation with YourBook, these properties
> will form a chain publishes, isBook... which is a sub property of
> publishesBook, and therefore the relation publishesBook will relate
> Springer to YourBook.
>
> Obviously you can easily do the same for publishesNewspaper &c.
>
> Alternatively, you can do the same for just the inverse (without a
> 'publishes' property): isBook o publishedBy -> bookPublishedBy
> Add publishesBook as inverse of bookPublishedBy to get the relation you
> wanted.
>
> Oh, and [2]
>
> -Rinke
>
> [1] shameless self-advertisement:
> http://www.amazon.com/Ontology-Representation-Intelligence-Applications-Dissertations/dp/1607500132/ref=sr_1_1?ie=UTF8&s=books&qid=1243929407&sr=8-1
>
>
> [2] http://www.webont.org/owled/2009/
>
>>
>>
>> Alan gave me a pointer that I'll dig through a bit later.
>>
>> Lee
>>
>>> (the "range" only works in one direction, i.e., if  Springer
>>> publishesBook  YourBook and the range of publishesBook is Book,
>>> *then* YourBook is an instance of Book --- but not the other way round)
>>> Did this answer your question? Cheers, Uli
>>>> thanks,
>>>> Lee
>>>>
>
>
>
> ---
> Drs Rinke Hoekstra
>
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