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Re: [ontolog-forum] What words mean

To: "[ontolog-forum] " <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Christopher Menzel <cmenzel@xxxxxxxx>
Date: Fri, 22 Feb 2008 12:34:19 -0600
Message-id: <0EA70A52-CBC4-4E73-A7BE-4B7DCFE25351@xxxxxxxx>
On Feb 22, 2008, at 12:23 PM, paola.dimaio@xxxxxxxxx wrote:
> Christopher and all
>
> is there a rule or other guideline to prescribe when a tree should  
> have one, and when more than one root?    (01)

You are (I take it) talking applications, while I'm just talking  
definitions, where the idea of how many roots a tree *should* have  
makes no sense.  Like many mathematical concepts, there are several  
reasonable ways to define a tree; on some, every tree has a single  
root; on others some trees do not.  Whether or not a definition that  
permits more than one root suits your purposes is up to you to decide.    (02)

-chris    (03)


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