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Re: [ontolog-forum] What words mean

To: "[ontolog-forum] " <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Pat Hayes <phayes@xxxxxxx>
Date: Wed, 20 Feb 2008 10:44:57 -0600
Message-id: <p06230901c3e208bbaaa7@[]>
At 1:47 PM +0000 2/20/08, <matthew.west@xxxxxxxxx> wrote:
>Dear John,
>I don't follow this.
>>  Interesting point:  In our work at VivoMind, we have found that
>>  Roget's _Thesaurus_ is more useful than WordNet for representing
>>  emotional terms and value judgments.  Since we use a partial ordering
>>  rather than a tree, we can treat the Roget classifications as the
>>  equivalent of WordNet synsets in a large partial ordering.
>I thought a tree structure was a partial ordering.    (01)

It is, but not necessarily the reverse. Partial 
orderings which are not tree-like are often more 
interesting and useful for some purposes, as they 
can 'fit' the data better when entities can be 
classified along many dimensions independently of 
one another: forcing the ordering to be tree-like 
introduces artifactual orderings between the 
dimensions.    (02)

>What do you see as
>the difference between a tree and a partial ordering?    (03)

A tree is a partial order which obeys the extra 
condition that each item has a unique immediate 
predecessor.    (04)

Pat    (05)

>Matthew West
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