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Re: rdf:first/rest/nil/List: syntax-only at the RDF level

From: Dan Connolly <connolly@w3.org>
Date: 31 Oct 2002 00:58:40 -0600
To: Pat Hayes <phayes@ai.uwf.edu>
Cc: w3c-rdfcore-wg@w3.org
Message-Id: <1036047521.7447.722.camel@dirk>


On Wed, 2002-10-30 at 17:00, pat hayes wrote:
> Equality, yes; but the proposed list semantics doesn't impose 
> equality.

I assumed it did; I don't know what to think now that
you say this... I'm not sure what you mean by
"real lists" if it doesn't involve a functional

> What would be the code problem of assuming that lists 
> always exist?

On pragmatic grounds, I don't have a problem.
cwm makes this assumption, for example.
But on theoretical grounds...


> >I think it's important that semantically, the RDF layer
> >is just the existential-conjuctive fragment of FOL.
> OK, fine: I agree that has a nice solid feel to it. But then we can't 
> have lists. Lists aren't even fully expressible in FOL, so I did 
> rather wonder when they got absorbed into RDF.

There is that.

I still think having the short-hand list syntax
is a good thing, and that it's usable in WebOnt.
I wish I could collect my thoughts in a convincing
message, but I think maybe the phone will be

Dan Connolly, W3C http://www.w3.org/People/Connolly/
Received on Thursday, 31 October 2002 01:58:21 UTC

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