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Re: Abstract syntax: an attempt

From: Graham Klyne <Graham.Klyne@Baltimore.com>
Date: Tue, 19 Jun 2001 11:20:12 +0100
Message-Id: <5.0.2.1.2.20010619110649.0351cb60@joy.songbird.com>
To: Brian McBride <bwm@hplb.hpl.hp.com>, Pat Hayes <phayes@ai.uwf.edu>
Cc: Sergey Melnik <melnik@db.stanford.edu>, w3c-rdfcore-wg <w3c-rdfcore-wg@w3.org>
At 09:16 AM 6/18/01 +0100, Brian McBride wrote:
>The upshot of that discussion is that there are (at least) two different
>concepts floating about, distinguished by the ideas of 'use' and 'mention'.
>
>The simplest examples to distinguish these I have seen are:
>
>   London is a city.
>   'London' is a word.
>
>The first of these is use, the second is mention of the name 'London'.
>
>A logical language needs both mechanisms.  Reification, as described in
>M&S is an example of mention e.g. Ralph said 'the sky is blue'.

 From something that Pat was saying in RDF-logic 
(<http://lists.w3.org/Archives/Public/www-rdf-logic/2001May/0071.html>), I 
thought that maybe quotation was NOT a necessary feature for RDF.

I'm still not entirely clear what is the difference between using quotation 
and truth functions vs modal operators, but it seems to me that the latter 
approach places some constraints on the things to which modal operators 
apply (unlike quotation/truth function which seems to be more of an 
any-expression-goes approach, which I suppose would be more difficult to 
capture logically).

#g


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Graham Klyne                    Baltimore Technologies
Strategic Research              Content Security Group
<Graham.Klyne@Baltimore.com>    <http://www.mimesweeper.com>
                                 <http://www.baltimore.com>
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Received on Tuesday, 19 June 2001 07:16:15 EDT

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