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Michael Champion wrote:
>
> On May 17, 2004, at 12:49 PM, John Song wrote:
>
> >
> > It seems that the most appealing thing to store RDF in NXD is that i
> > can utilize the index and other optimizing techniques to query
> > it,but i am no very sure about that.Could anybody give me some
> > advice?thanks.
> >
>
> My understanding is that the standardized XML serialization of RDF is
> not terribly interesting to query using XPath or XQuery because a) the
> numerous different ways one can serialize the same RDF model, and b)
> most of the interesting aspects of a query on RDF have to do with the
> inferences one can get from traversing the RDF graph, not from the
> nodes in isolation.
Adding to Mike's information in (a) above: The recently charted W3C RDF
Data Access Working Group ("DAWG"[1]) is tackling this very problem by
defining a standard query language for RDF-formatted data.
Kind Regards,
Joe Chiusano
Booz | Allen | Hamilton
Strategy and Technology Consultants to the World
[1] http://www.w3.org/2003/12/swa/dawg-charter
> Jonathan Robie's "The Syntactic Web" piece
> http://www.idealliance.org/papers/xml2001/papers/html/03-01-04.html
> addresses the first point by suggesting that normalized RDF be stored
> and queried, but I don't know how receptive the RDF world has been to
> it. If Jonathan is still on this list, he may be able to follow up.
>
> The current work I know about by Tamino customers tends to involve the
> combination of an RDF or OWL reasoner with the NXD. There are
> synergies there -- Huge ontologies don't fit efficiently into memory so
> DB support is helpful, and the XML queries only give the first cut of
> results, and an inferencer is needed to take them further.
>
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--
Kind Regards,
Joseph Chiusano
Associate
Booz | Allen | Hamilton
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