Data Model question - using a subject as a predicate

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?



Dr David Allsopp
                 Quidquid latine dictum sit, altum viditur.

Received on Thursday, 5 October 2000 07:10:36 UTC