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Re: Comments on RDF Concepts and Abstract Data Model

From: pat hayes <phayes@ai.uwf.edu>
Date: Thu, 21 Nov 2002 18:43:52 -0600
Message-Id: <p05111b2dba032dea1721@[10.0.100.86]>
To: "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
Cc: w3c-rdfcore-wg@w3.org

>From: pat hayes <phayes@ai.uwf.edu>
>Subject: Re: Comments on RDF Concepts and Abstract Data Model
>Date: Thu, 21 Nov 2002 14:24:09 -0600
>
>>  >From: pat hayes <phayes@ai.uwf.edu>
>>  >Subject: Re: Comments on RDF Concepts and Abstract Data Model
>>  >Date: Wed, 20 Nov 2002 13:14:27 -0600
>>  >
>>  >>  >From: Jeremy Carroll <jjc@hpl.hp.com>
>>  >>  >Subject: Re: Comments on RDF Concepts and Abstract Data Model
>>  >>  >Date: Mon, 18 Nov 2002 15:59:12 +0100
>>  >>  >
>>  >>  >>
>>  >>  >>  Hi Peter
>>  >>  >>
>>  >>  >>  I am responding to some of your comment
>>  >>  >>
>>  >>  >>
>>  >>http://lists.w3.org/Archives/Public/www-rdf-comments/2002OctDec/0053.html
>>  >>  >>
>>  >>  >>  in particular:
>>  >>  >>
>>  >>  >>  [[
>>  >>  >>  Major comment:
>>  >>  >>
>  > >>  >>  The RDF graph is syntax.  As such it makes no sense to 
>define a notion
>>  >>  >>  of equality over literals, which are pieces of syntax.
>>  >>
>>  >>  Peter, why do you say it makes no sense? It makes perfect sense to
>>  >>  me. If syntax is character strings, then equality is defined by
>>  >>  string equality; if it is some other kind of structure, then equality
>>  >>  is defined by other means. But it is still meaningful.
>>  >
>>  >Sure, it is possible to produce an equality relationship on syntax, and one
>>  >can do so without producing contradictions, but what has one achieved?
>>
>>  Call it 'identity' if you like to avoid the potential confusions with
>>  equality in the language (though I havnt seen much evidence of that
>>  confusion in practice). BUt heres an example of the need to get this
>>  clear: what does it mean to be the same bnode? Its easy to slip past
>>  the need to be clear on this, and this has caused large amounts of
>>  confusion already. Purely syntactic confusion, but confusion all the
>>  same.
>>
>>  Pat
>
>Oh, yes, I agree that this is an area where a clear definition is needed.
>However, this has nothing to do with literal equality, being much more akin
>to whether two tokens in the syntax of a programming language refer to the
>same variable.

But literals are RDF syntax. And simple literals denote themselves; 
so it's all the same issue.

Pat
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Received on Thursday, 21 November 2002 19:44:01 EST

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