OWL and RDFS (from public-webont-comments@w3.org)

Message-ID: <001301c2f9c8$08be7470$221f0125@shadow>
From: "Davide Noaro" <noarodavide@libero.it>
To: <public-webont-comments@w3.org>
Date: Thu, 3 Apr 2003 12:01:45 +0200
Subject: Re: [closed] Re: OWL Questions!

Thank you very much for your answers,
but i don't understand well.....

you say:

>1 - OWL is an extension of RDF(S) -- that is, all RDF and RDFS 
>documents are legal OWL Full documents  

OK!! If OWL is an extension....

>and all OWL documents are 
>legal RDFS documents

HOW is it possible if OWL allow more expressivity than RDFS?? 
So OWL and RDFS are equivalent .... 

and after you say:

>Not all RDFS documents are necesssarily in OWL Lite or OWL 
>Full. 

So not ALL RDFS documents are OWL documents i understand....

Have you make a mistake in writing or is all true what have you said? 

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Here what i have understand:

- OWL is an extension of RDFS and allow more expressivity than RDFS, in fact you can, for example say that a 
property is required (owl:minCardinality of 1) or optional 
(owl:minCardinality of 0) and other such things than IN RDFS YOU CAN'T!

-SO RDFS document are valid OWL documents, but NOT ALL OWL documents ARE  VALID RDFS DOCUMENTS.
( e.g. owl document in which i use owl:minCardinality, that in rdfs doesn't exist )

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Thanks if you can clarify me again the situation.
Davide.

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      Davide Noaro 
      noarodavide@libero.it
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