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Re: [ontolog-forum] Interpreting OWL

To: ontolog-forum@xxxxxxxxxxxxxxxx
From: "John F. Sowa" <sowa@xxxxxxxxxxx>
Date: Sun, 17 Oct 2010 23:29:49 -0400
Message-id: <4CBBBF2D.6030600@xxxxxxxxxxx>
On 10/17/2010 10:59 PM, doug foxvog wrote:
> It seems to me that the graph would have many disconnected subgraphs,
> and certainly not be a single tree.    (01)

Yes.  Technically, it would be a forest.    (02)

> The unusual case would be when there was a loop.  This could happen if
> a professor were to go for another PhD after a number of years, and
> have as a thesis advisor in the new field a former student or even
> student of a student.    (03)

Yes.    (04)

On 10/17/2010 11:20 PM, Rich Cooper wrote:
> Is there any looser constraint, or must the graph be a DAG at all to be
> fully distinguishable<persons/objects/things>  among the paths?    (05)

If all relations are symmetric, the graph would not be directed.
But most relations are not symmetric.    (06)

John    (07)

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