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[protege-owl] Layered Ontologies?

Thomas Russ tar at ISI.EDU
Wed Mar 4 14:14:47 PST 2009


On Mar 3, 2009, at 10:37 AM, Johann Petrak wrote:

> Pitonyak, Andrew D wrote:
>> Do you know the term Reification? The typical definition is to  
>> create a resource to act as a proxy for an object that you can not  
>> address.
>>
>> As this relates to RDF and OWL, you want to reference a statement  
>> (for example, who stated that fact?).
>>
>> _:55445 rdf:type       rdf:Statement .
>> _:55445 rdf subject    a:productA
>> _:55445 rdf:predicate  a:weight
>> _:55445 rdf:object     "1.2"
>> _:55445 dc:creator     a:Bob
>>
>
> Yes, I know about reification, but I do not like it ;)
> As has been pointed out in a previous email, any reified
> statement leads a strange "double" life as far as
> e.g. SPARQL Queries are concerned. So one cannot
> just use the reified version of the triple alone and
> as it seems, one has to make sure to always have both
> versions in the store. Also this creates issues when
> maintaining a  store that has both the original and
> the reified versions of triples.

Some of this could be solved by using SWRL rules to produce the un- 
reified form of the property.  Of course, you would need a separate  
rule for each property you reified, since SWRL doesn't allow second  
order rules to be written.





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