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Re: Issue 3.4 - daml:UnambiguousProperty (fwd)

From: Jim Hendler <hendler@cs.umd.edu>
Date: Thu, 6 Jun 2002 09:37:08 -0400
Message-Id: <p05111702b92515077f4e@[128.8.127.214]>
To: "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>, danbri@w3.org
Cc: www-webont-wg@w3.org

At 8:32 AM -0400 6/6/02, Peter F. Patel-Schneider wrote:
>From: Dan Brickley <danbri@w3.org>
>Subject: Re: Issue 3.4 - daml:UnambiguousProperty (fwd)
>Date: Thu, 6 Jun 2002 08:02:13 -0400 (EDT)
>
>>
>>
>>  Re motivating daml:UnambiguousProperty, here are some public but offlist
>>  notes I made a little while ago, and which Libby just mentioned.
>>
>>  Dan
>>
>>  ---------- Forwarded message ----------
>>  Date: Thu, 30 May 2002 09:34:19 -0400 (EDT)
>>  From: Dan Brickley <danbri@w3.org>
>>  To: Jim Hendler <hendler@cs.umd.edu>
>>  Cc: connolly@w3.org, massimo@w3.org, www-archive@w3.org,
>>       libby.miller@bris.ac.uk, Guus Schreiber <schreiber@swi.psy.uva.nl>
>>  Subject: Re: Issue 3.4 - daml:UnambiguousProperty
>>  Resent-Date: Thu, 30 May 2002 09:35:05 -0400 (EDT)
>>  Resent-From: www-archive@w3.org
>>
>>
>>
>>  Oops, Guus and Libby's addresses were missing from CC list; resending.
>>
>>  imho UnambiguousProperty is the most important thing for WebOnt to get
>>  riht, and since there are some subtleties (eg. unambiguity of a property
>>  over time)
>
>I am totally confused as to why you would think that WebOnt is concerned
>with time.  Could you please let me know why you think that WebOnt should
>be concerned with the time-varying behaviour of properties?

Peter - have you read our requirements document?  I believe Dan is 
referring to versioning issues here --  a good example - one of Dan's 
projects, foaf, has an unambiguous property of mailing address, but 
unfortunately, mine is set in his instance base as 
"mailto:jhendler@darpa.mil"  - without some versioning, he cannot 
simply assert my new mailto (the darpa one no longer works) without a 
reasoner being entitled to say "that is an error, this is an 
unambiguous property" --  I don't think Dan is asking for any sort of 
complex temporal reasoning (which I would immediately and happily 
rule out of scope) - but rather pointing out that we must consider 
change in our instance base when we work out our solution to 
versioning.
  The versioning issue is not open at the moment, so I won't go on
  -Jim H.

-- 
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, 6 June 2002 09:37:20 GMT

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