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Re: Slim RDF

From: Sergey Melnik <melnik@db.stanford.edu>
Date: Mon, 19 Feb 2001 14:51:02 -0800
Message-ID: <3A91A356.22B0AFA6@db.stanford.edu>
To: "McBride, Brian" <bwm@hplb.hpl.hp.com>
CC: RDF Interest Group <www-rdf-interest@w3.org>
"McBride, Brian" wrote:
> 
> Hi Sergey,
> 
> In the model you describe, it seems that ExExE is a subset of E.
> Is E a well formed set?

It is, this can be proven formally.

Sergey


> 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.
Received on Monday, 19 February 2001 17:45:38 GMT

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