W3C home > Mailing lists > Public > w3c-rdfcore-wg@w3.org > June 2002

Re: rdfms-syntax-incomplete

From: Patrick Stickler <patrick.stickler@nokia.com>
Date: Fri, 28 Jun 2002 12:06:55 +0300
To: Pat Hayes <phayes@ai.uwf.edu>, Jeremy Carroll <jjc@hplb.hpl.hp.com>
CC: RDF Core <w3c-rdfcore-wg@w3.org>
Message-ID: <B94201DF.1792B%patrick.stickler@nokia.com>

On 2002-06-28 9:14, "ext pat hayes" <phayes@ai.uwf.edu> wrote:

>> At the f2f one of the postponed issues that I wished to advocate
>> reopening was:
>> http://www.w3.org/2000/03/rdf-tracking/#rdfms-syntax-incomplete
>> In particular, given the amount of change we have made I think a
>> small change to
>> rectify the bnode serialization problem should be considered.
>> However we were out of time, and so I have decided to raise this by e-mail.
>> This is primarily motivated for me by Jena development.
>> Within Jena we have repeated user requirement to enable round-tripping.
>> e.g. one of our summer students yesterday said words like: "we use N-triple
>> as
>> our transport becuase bNodes are important."
>> Since we are not proposing N-triple as a standard, we do have some
>> obligation to
>> make RDF/XML useable.
>> I propose that we should modify the RDF/XML syntax to permit bNode labels
>> "_:foo" wherever we currently permit URI refs.
> Would that be extendable to allow nodeIDs on literal nodes, also, to
> handle untidy literals?

Seems so to me.

One could simply view untidy literal nodes as analogous to bnodes
with literal labels. Each denotes a (potentially) different resource
and the literal label provides a contextual name for that resource,
but since the literal label does not have globally constent meaning
(as does a URIref) the denotation is underspecified without that context.

As with a bnode, you know it denotes "something", but you don't
necessarily know exactly what that is, insofar as some global
name (URIref) is concerned.

So, _:foo is a bnode and _:bar"1234" is a literal node. Both are
"untidy" and the nodeID simply disappears in the graph representation,
leaving only the literal string in the case of the literal node.
_:foo -> "", _:bar"1234" -> "1234".



Patrick Stickler              Phone: +358 50 483 9453
Senior Research Scientist     Fax:   +358 7180 35409
Nokia Research Center         Email: patrick.stickler@nokia.com
Received on Friday, 28 June 2002 05:02:24 UTC

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