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about reification and exactly one

From: <jos.deroo.jd@belgium.agfa.com>
Date: Mon, 25 Sep 2000 21:42:50 +0200
To: " - *www-rdf-interest@w3.org" <www-rdf-interest@w3.org>
Cc: " - *jborden@mediaone.net" <jborden@mediaone.net>
Message-Id: <0006800031581173000002L032*@MHS>
In http://www.w3.org/TR/1999/REC-rdf-syntax-19990222/#model
5. Formal Model for RDF
...
When a resource represents a reified statement; that is,
it has an RDF:type property with a value of RDF:Statement,
then that resource must have exactly one RDF:subject property,
one RDF:object property, and one RDF:predicate property.
...
So exactly one, not zero, not more than one.
I think this is not difficult at all.
The things to model a statement are clearly defined
and agents must be made consistent in this respect.

Jonathan, there is indeed nothing in the spec to stop
you doing reification of reification statements, so I
was wrong. The "4 exponent reificationlevel" size issue
is not relevant for our internal model representation.

Jos De Roo -- AGFA
Received on Tuesday, 26 September 2000 20:29:28 GMT

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