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RE: Why the encapsulation?

From: Michael Schneider <schneid@fzi.de>
Date: Sun, 23 Sep 2007 20:15:42 +0200
Message-ID: <0EF30CAA69519C4CB91D01481AEA06A040A140@judith.fzi.de>
To: "Danny Ayers" <danny.ayers@gmail.com>
Cc: "Emanuele D'Arrigo" <manu3d@gmail.com>, "public-owl-dev-request@w3.org" <public-owl-dev@w3.org>
Hi, Danny!

>-----Original Message-----
>From: Danny Ayers [mailto:danny.ayers@gmail.com] 
>Sent: Sunday, September 23, 2007 7:19 PM
>To: Michael Schneider
>Cc: Emanuele D'Arrigo; public-owl-dev-request@w3.org
>Subject: Re: Why the encapsulation?
>
>On 23/09/2007, Michael Schneider <schneid@fzi.de> wrote:
>
>> ><owl:ObjectProperty rdf:ID="hasBankAccount">
>> > <rdfs:domain>
>> >       <owl:Class rdf:about="#Person"/>
>> >       <owl:Class rdf:about="#Corporation"/>
>> > </rdfs:domain>
>>
>> This is simply a syntax error: You have to give a /single/ 
>resource to the
>> 'rdfs:domain' property, but you put in /two/ of them.
>
>I'm curious, would I be missing something in saying:
>
><owl:ObjectProperty rdf:ID="hasBankAccount">
>    <rdfs:domain rdf:resource="#Person"/>
>    <rdfs:domain rdf:resource="#Corporation"/>
></owl:ObjectProperty>
>
>- is ok syntax, but the meaning would be different, in that the object
>of an hasBankAccount statement in this case would be both a Person and
>a Corporation, rather than a Person and/or a Corporation in the union
>version?

Right! In this case, this is then the intersection of the two domains. It is
explained in the RDF primer at:

  http://www.w3.org/TR/rdf-primer/#properties


There is an example given, similar to yours:

  exterms:weight   rdfs:domain   ex:Book .
  exterms:weight   rdfs:domain   ex:MotorVehicle .

And the text explains:

  "If exterms:weight has more than one domain property, 
  say one specifying ex:Book as the domain and another one 
  specifying ex:MotorVehicle as the domain, this says that 
  any resource that has a exterms:weight property is an 
  instance of all of the classes specified as the domains, 
  i.e., that any resource that has a exterms:weight property 
  is both a ex:Book  and a ex:MotorVehicle (illustrating 
  the need for care in specifying domains and ranges)."

Cheers,
Michael

--
Dipl.-Inform. Michael Schneider
FZI Forschungszentrum Informatik Karlsruhe
Abtl. Information Process Engineering (IPE)
Tel  : +49-721-9654-726
Fax  : +49-721-9654-727
Email: Michael.Schneider@fzi.de
Web  : http://www.fzi.de/ipe/eng/mitarbeiter.php?id=555


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Received on Sunday, 23 September 2007 18:16:00 UTC

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