[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Meta-somethingorother (was the semantic web mega-permathre
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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