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RE: Slim RDF

From: McBride, Brian <bwm@hplb.hpl.hp.com>
Date: Mon, 19 Feb 2001 15:10:40 -0000
Message-ID: <5E13A1874524D411A876006008CD059F23963F@0-mail-1.hpl.hp.com>
To: "'Sergey Melnik'" <melnik@db.stanford.edu>, RDF Interest Group <www-rdf-interest@w3.org>
Hi Sergey,

In the model you describe, it seems that ExExE is a subset of E.
Is E a well formed set?

Brian


> -----Original Message-----
> From: Sergey Melnik [mailto:melnik@db.stanford.edu]
> Sent: 12 February 2001 20:09
> To: RDF Interest Group
> Subject: Slim RDF
> 
> 
> Following the recent discussion on wrt syntax and namespaces 
> I'd like to
> mention the internal data model based on RDF that I'm using in my
> research:
> 
> Let U be the Unicode alphabet and U* the set of strings 
> defined over U.
> The set of entities E and the set of statements V are defined 
> using the
> following recursive definition:
> 
> 1. U*xU* is subset of E (any tuple consisting of two strings is an
> entity; the first string of the tuple is called namespace of 
> the entity,
> the second string is referred to as name of the entity)
> 
> 2. ExExE is subset of V (every tuple of three entities constitutes a
> statement)
> 
> 3. V is subset of E (every statement is an entity)
> 
> A subset of V is called "model". Without reification, E=U*xU* 
> and V=E^3.
> 
> The set of literals L is defined as L = {"urn:rdf:literal"} x U* (i.e.
> literals are resources and can be used as subjects of 
> statements). Other
> primitive data types are handled similarly, e.g. 
> ("urn:rdf:literal","5")
> != ("urn:rdf:integer","5").
> 
> Notice that namespaces are first-class citizens. Resource ("xyz","")
> 'reifies' namespace "xyz", so that statements about primitive classes
> like the class of literals are possible.
> 
> The above data model subsumes the RDF model defined in M&S 1.0.
> 
> Sergey
> 
> P.S.: since Oct 2000, RDF API
> (http://www-db.stanford.edu/~melnik/rdf/api.html) supports 
> namespaces as
> part of the model, so that both parser and serializer included in the
> API can handle resources like
> ("http://www.w3.org/1999/XMLSchema","date") correctly.
> 
> -- 
> E-Mail:      melnik@db.stanford.edu (Sergey Melnik)
> WWW:         http://www-db.stanford.edu/~melnik
> Tel:         OFFICE: 1-650-725-4312 (USA)
> Address:     Room 438, Gates, Stanford University, CA 94305, USA
> 
Received on Monday, 19 February 2001 10:10:47 GMT

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