Is there an implementer's convention for indicating false?

I'm wondering if there's any common convention among implementers of RDF 
inference systems for indicating that some offered premis is unsatisfiable, 
in systems where all results are presented as some form of RDF.

e.g.

    _:a owl:sameAs "1" .
    _:a owl:sameAs "2" .
=>
    ?

(expressed as an RDF graph.)

#g


------------
Graham Klyne
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Received on Tuesday, 11 November 2003 12:14:57 UTC