# Re: A Rough Guide to Notation3

From: Jos De_Roo <jos.deroo.jd@belgium.agfa.com>
Date: Sat, 24 Aug 2002 16:32:45 +0200
To: Sandro Hawke <sandro@w3.org>
Cc: "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>, sean@mysterylights.com, seth@robustai.net, www-rdf-interest@w3.org
Message-ID: <OF21462A96.323DBA97-ONC1256C1F.004FDE07@agfa.be>
```
> > Well, I prefer Peter's option 1 as we already have it in N3 e.g.
> >   P log:implies C .
> > which is actually
> >   ~P log:or C .
> > and indeed neither ~P nor C are asserted, just their disjunction.
> > I really don't see any problem in selfreference as long as you
> > are not asserting your own truth-conditions, or as Pat once wrote
>
> You can do that in N3 because it has a nested syntax, which allows you
> to use formulas which are guaranteed to be non-self-referencial (since
> they appear as {...} syntactic structures, which clearly cannot
> contain themselves).  But if you flatten those syntactic structures
> out into triples, so we can put it in RDF, then you're allowing people
to
> say
>    P is_the_sentence (P log:implies C)
> and
>    P is_the_sentence (P is false)
> which is a problem.   (I think the problem is addressable, in a way
> which doesn't hamper ordinary use, as I suggest in this message's
> grandparent.   But it does require some complexity in ones
> definitions.)

or as long as you are not asserting your own truth-conditions
which could be easily detected (e.g. what we do in Euler and
in that case we simply strike those and so become incomplete)

-- ,
Jos De Roo, AGFA http://www.agfa.com/w3c/jdroo/
```
Received on Saturday, 24 August 2002 10:33:23 UTC

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