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Re: Querying Syntax

From: Libby Miller <Libby.Miller@bristol.ac.uk>
Date: Wed, 11 Oct 2000 20:29:43 +0100 (BST)
To: Ross Judson <ross@ManagedObjects.com>
cc: www-rdf-interest <www-rdf-interest@w3.org>, Ashok Malhotra/Watson/IBM <petsa@us.ibm.com>
Message-ID: <Pine.GHP.4.21.0010112006380.16897-100000@mail.ilrt.bris.ac.uk>


Hi Ross,

R.V.Guha's RDFdb uses an sql-like query language

http://web1.guha.com/rdfdb/
http://web1.guha.com/rdfdb/query.html

I've been looking at using this and the conceptually similar Algenon

http://lists.w3.org/Archives/Public/www-rdf-interest/1999Dec/0106.html

used by Eric Prud'hommeaux to create a layer above various RDF APIs to
allow more complex queries, in Java. I've, er, not got anything good
enough to show people yet, but soon.

About querying in XML - I'm of the inclination that an SQL-like
language would be more conducive to people actually using it, but in
any case, if you split up queries into triples, as you can with both the
languages used above, then you could describe the same query in XML
using some sort of basic triple syntax, like in Jos De Roo's post last
month

http://lists.w3.org/Archives/Public/www-rdf-interest/2000Sep/0247.html

So my code uses triples as the underlying mechanism for query, and so
it's trivial whether you call that code using xml or a query string.

There's a bit more stuff on rdf query at the RDf interest group page

http://www.w3.org/RDF/Interest/


hope this is of use,

Libby miller




On Wed, 11 Oct 2000, Ross Judson wrote:
> 
> 
> Your paper was presented during the query language workshop; have there been
> other such papers?  Is there any other movement on the RDF query front?
> 
> RJ
> 
> ----- Original Message -----
> From: "Ashok Malhotra/Watson/IBM" <petsa@us.ibm.com>
> To: "Ross Judson" <ross@ManagedObjects.com>
> Cc: <www-rdf-interest@w3.org>
> Sent: Wednesday, October 11, 2000 12:28 PM
> Subject: Re: Querying Syntax
> 
> 
> >
> > Neel Sunderesan and I wrote a paper on RDF Query for the XML Query
> Workshop
> > in December 1998.  Some of you may find it interesting.  You can access it
> > at
> > http://www.w3.org/TandS/QL/QL98/pp/rdfquery.html
> > If you have trouble getting to this I can send you a copy.
> >
> > All the best, Ashok
> 
> 
> 
Received on Wednesday, 11 October 2000 15:29:56 GMT

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