Re: a bnode URI scheme?!

> Consider the address bnode example in the RDF Primer 
> (http://www.w3.org/TR/2004/REC-rdf-primer-20040210/#structuredproperties).
> There may be times when you want to reference that address externally 
> (e.g. from another model) but the common sense approach to enable that 
> by just replacing the bNode with a URI reference has a couple of problems:
> * it changes the meaning of the model: bNodes serve as existential 
> variables -- if you replace two distinct bNodes x and y with 2 different 
> URIs you are adding information to the model: because there is nothing 
> in the model that says x and y might not be equal but the two URIs that 
> replace are indeed not equal (since RDF uses intensional semantics for 
> URIs).

Not true.   

I think you're saying 

<a> <b> <c>.
<d> <e> <f>.

entails

<a> owl:differentFrom <d>.

... but I really don't think that's the case.  Can you find some
supporting text?

(My recommendation: bNodes are a real pain to reason about, so avoid
them unless doing so is an even bigger pain.)

       -- sandro