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comment: http://www.w3.org/TR/swbp-n-aryRelations/

From: Samson Tu <tu@SMI.Stanford.EDU>
Date: Thu, 12 Aug 2004 13:57:26 -0700
Message-ID: <411BD9B6.8090608@smi.stanford.edu>
To: public-swbp-wg@w3.org, tu <tu@SMI.Stanford.EDU>, "Natasha F. Noy" <noy@SMI.Stanford.EDU>

The working note "Defining N-ary Relations on the Semantic Web: Use With 
Individuals" W3C Working Draft 21 July 2004

uses the same representation for the two use cases "Christine has breast 
tumor with high probability" and "Steve has temperature, which is high, 
but falling".

However, there is a possible semantic distinction between the two that 
should be modeled explicitly. "Christine has breast tumor" uniquely 
determines "high probablity." If you think of 
diagnostic-relation/person/disease/probability as a relation, then the 
first 3 forms a key.

A use case "At 2004/07/31 10:00, Christine's temperature is 39 degrees" 
illustrates the the distinction better than the "Steve" use case. In the 
temperature/person/value/time-stamp relation, temperature/person/value 
triplet does not determine the time stamp. In that sense, the 
"value/time-stamp" pair is the real "value" of the binary temperature 
relation.

Samson
-- 
Samson Tu                    email: tu@smi.stanford.edu or
Senior Research Scientist           swt@stanford.edu
Stanford Medical Informatics phone: 1-650-725-3391
Stanford University          fax: 1-650-725-7944
Received on Thursday, 12 August 2004 20:59:26 UTC

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