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Data Model question - using a subject as a predicate

From: David Allsopp <dallsopp@signal.dera.gov.uk>
Date: Thu, 05 Oct 2000 12:10:00 +0100
Message-ID: <39DC6188.D7AE20F3@signal.dera.gov.uk>
To: "www-rdf-interest@w3.org" <www-rdf-interest@w3.org>

Hello all,

Another question about the RDF Data Model:

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
In the formal model we have:

1. There is a set called 'Resources'
2. There is a set called 'Literals'
3. There is a subset of 'Resources' called 'Properties'
4. There is a set called 'Statements', each element of which is a triple
of the form {pred, sub obj}

where pred is a property (member of 'Properties'), sub is a resource
(member of 'Resources') and obj is either a resource or a literal
(member of 'Literals').
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

This seems to imply that a resource already being used as a subject or
object (i.e. not currently a member of the subset 'Properties') can
later be used as a predicate (by the addition of a further triple to the
model). This resource then becomes a member of the subset 'Properties').

Is this correct?  Can someone give a practical example where this might
be useful, or at least make sense?

Thanks,

David.

-- 
Dr David Allsopp
                 Quidquid latine dictum sit, altum viditur.
Received on Thursday, 5 October 2000 07:10:36 GMT

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