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Re: Semantics of rdf:Statement

From: Toby Inkster <tai@g5n.co.uk>
Date: Wed, 06 Jan 2010 10:30:31 +0000
To: Pat Hayes <phayes@ihmc.us>
Cc: darood <samatar.sharmarke@gmail.com>, semantic-web@w3.org
Message-ID: <1262773831.2855.591.camel@ophelia2.g5n.co.uk>
On Tue, 2010-01-05 at 00:54 -0600, Pat Hayes wrote:
> On Jan 4, 2010, at 5:11 PM, darood wrote:
>
> > •     “sister of” - Symmetric
> 
> No. Mary sisterOf John, but not John sisterOf Mary. 

Depending on your definition of "sister of" with regards to
step-sisters, half-sisters, sisters-in-law, etc, the relation may be
transitive though.

{ :Mary :sisterOf :John . :Anne :sisterOf :Mary . }
    => { :Anne :sisterOf :John . } .

Amongst an all-female population, sisterOf becomes a symmetric
relationship too. 

A slightly broader transitive "sisterOf-or-sameAs" relationship (that
is, a definition which effectively counts each woman herself amongst her
own sisters), in an all-female population is an equivalence
relationship.

-- 
Toby A Inkster
<mailto:mail@tobyinkster.co.uk>
<http://tobyinkster.co.uk>
Received on Wednesday, 6 January 2010 10:31:13 UTC

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