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Re: [BLD] comments on BLD draft

From: Christian de Sainte Marie <csma@ilog.fr>
Date: Tue, 15 Apr 2008 18:56:15 +0200
Message-ID: <4804DE2F.7030809@ilog.fr>
To: Michael Kifer <kifer@cs.sunysb.edu>
CC: "Boley, Harold" <Harold.Boley@nrc-cnrc.gc.ca>, RIF WG <public-rif-wg@w3.org>

Michael Kifer wrote:
>>
>>No, I meant: in "# Equality terms. If t and s are simple, positional, or 
>>named-argument terms then t = s is an equality term.", shouldn't t and s 
>>be allowed to be external terms as well (same for #, ## and frame)?
>>
> I think that equality among external terms should *not* be allowed, since
> it cannot be tested anyway (definition of an external term is a black box
> to a rif document, by definition).

It can be tested by the consumer: if it could not, a RIF document that 
contained external calls would be useless, wouldn't it?

> For instance, one could write External(t) = External(s)
> but these two externals' black boxes might not be equal, and the reasoner
> will have no way of testing that.

I can see that equality or classification terms with external terms may 
be a problem in the head; but in the body?

Christian
Received on Tuesday, 15 April 2008 16:57:15 GMT

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