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Re: Meta-somethingorother (was the semantic web mega-permathre


semantic web utopia
Dare Obasanjo wrote:

>For this to work (a) every description of a person must use the same data model & (b) there needs to exist a mapping from your applications data model to that of the unknown schema available somewhere. This seems fairly optimistic to me and highly unlikely in the geenral case in practice. 
>  
>
a) This is *explicity* untrue -- read the OWL requirements doc. 
http://www.w3.org/TR/2004/REC-webont-req-20040210/

see 3.3 Ontology interoperability
"Different ontologies may model the same concept in different ways..." 
as well as requirements:
R2,R3,R4,R11

b) mapping from "data model" to "schema" is done via URIs as well as the 
OWL operators:
owl:sameAs
owl:equivalentClass
owl:equivalentProperty

The sum of this is that different models/ontologies of a "Person" can 
interoperate. This is one of the huge benefits of *not* having a fixed 
schema with represented as a fixed set of relational columns in which to 
represent a person. Different ontologies might define different 
properties of a person (each ontology defines the properties a 
particular application might be interested in). *Somewhere else* an 
inferencing engine can declare two "people" to the the same -- that is, 
for example, one person represented in a credit card transaction 
(identified via a signature and CC number) as the _same as_ another 
representation of the _same_ person, perhaps identified by a different 
credit card transaction, or perhaps as identified by a tax return 
(social security number)... use your imagination. I am not saying that 
there aren't processing issues *possible*, only that one does not need 
to use a fixed "schema".

> 
>Semantic Web proponents tend to gloss over these points whenever describing the Semantic Web utopia. 
> 
>  
>
If you read the WebOnt use cases and requirements document, that is 
explicitly not the case -- so perhaps what you say is true for "Semantic 
Web proponents" who haven't been involved with the actual development of 
semantic web standards.

Jonathan

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