Michel Pelletier wrote:

>On Wed, 2005-08-24 at 15:28 -0400, [EMAIL PROTECTED] wrote:
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>>Message: 5
>>Date: Wed, 24 Aug 2005 20:24:30 +0200
>>From: Jean-Marc Orliaguet <[EMAIL PROTECTED]>
>>Subject: [Zope3-dev] [DRAFT] local portlets and perspectives
>>    
>>
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>>It is built on the notion of "Perspective" (see the link) and on the
>>idea of querying the catalog using triadic relations instead of joining
>>sets of query results based on dyadic predicates (such as with RDF).
>>    
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>
>I've been looking for more info on Peirce relations since you mentioned
>them to me in Paris, but I haven't found much.  This is a good one I've
>found so far:
>
>http://www.angelfire.com/md2/timewarp/peirce.html
>
>I like:
>
>"""According to Peirce, ‘meaning’ is a triadic relation between a sign,
>an object, and an interpretant. This triadic relation is not reducible
>to a set of dyadic relations between a sign and an object or between an
>object and an interpretant (CP 1.345). Meaning is never reducible to
>Firstness or Secondness, but can only be a ‘genuine’ Thirdness. A
>general meaning can always be found in ‘genuine’ triadic relations, but
>can never be found in ‘degenerate’ triadic relations which have lost
>their Thirdness."""
>
>Word.  But it sounds to me from the description that follows that RDF is
>a triadic relation, but I'm no semiotic phenomenologist.  Do you know of
>more references on this subject?
>
>Another thought, can a Peirce relation be meta-encoded in RDF?
>
>-Michel
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>

Hi Michel!

You would need a quadruple store in that case (see the previous mail) -
a triple store is not enough, since in the triple store one place is
already taken by the predicate.

if you have (Subject, Predicate, Object) in RDF

here you have:
- monadic relation: (first, predicate)
- dyadic relation: (first, second, predicate)
- triadic relation: (first, second, third, predicate)

then not necessary all triadic relations are genuine, but at least there
are three elements in them and a unity which a combination of dyadic
relations won't give you.

see also:
http://svn.nuxeo.org/trac/pub/file/z3lab/cpsskins/trunk/doc/peirce-relations.txt

/JM


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