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Re: Versioning vs Temporal modeling of Patient State

From: Chimezie Ogbuji <ogbujic@bio.ri.ccf.org>
Date: Thu, 11 Jan 2007 16:48:11 -0500 (EST)
To: "Kashyap, Vipul" <VKASHYAP1@partners.org>
cc: Nigam Haresh Shah <nigam@stanford.edu>, Trish Whetzel <whetzel@pcbi.upenn.edu>, kc28 <kei.cheung@yale.edu>, Alan Ruttenberg <alanruttenberg@gmail.com>, w3c semweb hcls <public-semweb-lifesci@w3.org>
Message-ID: <Pine.GSO.4.60.0701111641070.16923@joplin.bio.ri.ccf.org>

On Thu, 11 Jan 2007, Kashyap, Vipul wrote:
> Nigam,
> This is an interesting example...
>> Have an example for this one: If the instance is of a the class "Tumor"
>> then
>> on giving treatment it changes in size, shape etc, and might ultimately
>> disappear. On each visit we are observing a different version of the tumor
>> instance [in Tom].
> [VK] Clearly there is a longitudinal aspect to this as the state of the tumor
> changes over time....

  .. snip ..

> IMHO, the former representation conveys more information and meaning...
> So, it may make sense not to confound versioning with temporal progression...

Spot on. I myself have had a hard time trying to grapple with the notion 
of allowing 'content' revision control to trickle into formal knoweldge 
representation and have yet to come across a scenario that demonstrates 
where this makes any sense.

If a class has a particular 'definition' (i.e., the criteria for 
membership of its instances) at a particular time and that definition 
'changes' then we are talking about a different class 
altogether not a 'version' of the same class - the extension of both 
classes are no longer the same.  Unless the definition change is 
annotative only and doesn't really have any 'logical' consequences.  In 
which case a SKOS, time-stamped annotation for a human reader is 
sufficient and what we really have in mind.

Chimezie Ogbuji
Lead Systems Analyst
Thoracic and Cardiovascular Surgery
Cleveland Clinic Foundation
9500 Euclid Avenue/ W26
Cleveland, Ohio 44195
Office: (216)444-8593
Received on Thursday, 11 January 2007 21:48:22 UTC

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