W3C home > Mailing lists > Public > w3c-rdfcore-wg@w3.org > November 2001

Re: Issue rdf-equivalent-representations

From: Pat Hayes <phayes@ai.uwf.edu>
Date: Wed, 14 Nov 2001 20:29:09 -0600
Message-Id: <p0510105db818d8908ce6@[]>
To: Brian McBride <bwm@hplb.hpl.hp.com>
Cc: w3c-rdfcore-wg@w3.org
>   http://www.w3.org/2000/03/rdf-tracking/#rdf-equivalent-representations
>[Equivalence]: There are four RDF model "flavours" (formal/data 
>model, graph(ical) model, serialization syntax, triple). To what 
>extend (precisely) are these models (not) equivalent? (Problems 
>related to anonymity have been discussed, see also below, details 
>need to be summarized). Could trying to find transformation grammars 
>be a solution (preciseness, determination of equivalence)? Shouldn't 
>this be in a "formal" part of M&S spec?
>Propose that
>   o The WG believes that:
>      - the graph model which is the basis for the model theory
>      - the n-Triples representation of an RDF graph

My only concern is that some of the datatyping schemes might need 
something like Ntriples++ to describe the graphs they use, and I 
would like to leave that option open until we get these issues 
decided. Otherwise, OK.

>      - the diagrams of graphs used in documents such as the RDF Model
>        and Syntax document
>    are all equivalent.
>   o The WG notes that the RDF/XML syntax as currently defined is unable
>     to represent an arbritary RDF graph.  In particular, the RDF/XML syntax
>     cannot fully represent a bNode which is the object of more than one
>     statement.
>   o The WG believes that extending the RDF/XML syntax so that it can 
>     all RDF graphs is beyond the scope of its current charter and resolves
>     to postpone consideration of this issue.
>   o The WG actions the editor of the RDF Syntax WD to include in that
>     document a clear statement of the RDF graph structures that RDF/XML is
>     unable to represent.

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Received on Wednesday, 14 November 2001 21:29:07 UTC

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