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Re: Issue 2.2 - Adding properties to someone else's instances

From: Jim Hendler <hendler@cs.umd.edu>
Date: Thu, 30 May 2002 19:32:45 -0400
Message-Id: <p0511173fb91c65105dd8@[10.0.1.4]>
To: patrick hayes <phayes@ai.uwf.edu>
Cc: www-webont-wg@w3.org

At 2:13 PM -0500 5/30/02, patrick hayes wrote:
>>  Issue 2.2 - Adding properties to someone else's instances
>>
>>status - OPEN,
>>
>>  Proposal - CLOSE THIS ISSUE
>>
>>Our Working group has decided to use RDF/XML as our exchange 
>>framework and that the semantics of our documents will be carried 
>>by the triple store corresponding to this document.
>
>That sentence is hard to interpret precisely. The triple store does 
>not 'carry' a particular semantics. Which semantics are supposed to 
>be used to interpret the triple store? (RDF/RDFS/RDFS with 
>datatyping/OWL/....??)
>
>>  The basic RDF model [1] allows documents to refer to and extend
>
>How does it allow one to refer to another graph? (Do you mean reification?)
>
>>the graphs represented by other documents, and thus properties can 
>>be added to instances expressed in other documents.

Pat - I was trying for somethign really simple.  You say
  pat:Pat a ex:human.

I say
  pat:Pat foo:eyecolor bar:blue

I've essentially added a property to your instance if something 
collects both our sentences into the same triple store (graph). 
Since pat:Pat is a URIref, this isn't problematic.  As far as whose 
semantics, I'd say OWLs, since this goes in the OWL doc, and I sure 
hope the RDF/RDFS/RDFSwdatatyping/OWLCore/OWL world is consistent 
enough that that doesn't cause too much trouble.

As I've said before - I'd welcome specific wording changes to make 
this more understandable.  I planned to copy the wording from our 
resolutions at the f2f in Adam, but couldn't get to the server when I 
composed this message last night.

would the following be better:

Our Working Group has decided that the meaning of an OWL document is 
conveyed in the RDF graph (produced by processing that document 
according to @@RDF spec).  Since the RDF model allows these graphs to 
be produced from multiple documents created by multiple users, and 
since the instances are defined so that they can be umabiguously 
referred to by URI reference, it is possible for one document to 
include instance information from another, and to create a document 
that conveys the semantics of adding a property to someone else's 
instance.



-- 
Professor James Hendler				  hendler@cs.umd.edu
Director, Semantic Web and Agent Technologies	  301-405-2696
Maryland Information and Network Dynamics Lab.	  301-405-6707 (Fax)
Univ of Maryland, College Park, MD 20742	  240-731-3822 (Cell)
http://www.cs.umd.edu/users/hendler
Received on Thursday, 30 May 2002 19:33:28 GMT

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