W3C home > Mailing lists > Public > www-rdf-logic@w3.org > May 2001

RE: relational mapping?

From: Danny Ayers <danny@panlanka.net>
Date: Fri, 4 May 2001 00:47:39 +0600
To: <ahill@openlinksw.com>
Cc: "Www-Rdf-Logic" <www-rdf-logic@w3.org>
Message-ID: <EBEPLGMHCDOJJJPCFHEFOENFDEAA.danny@panlanka.net>
Thanks. Unfortunately I'm not looking for a commercial product, though
looking at some of the spec it certainly looks impressive.
I'm curious - what exactly is 'Native XML Storage'?


---
Danny Ayers
http://www.isacat.net

<- -----Original Message-----
<- From: www-rdf-logic-request@w3.org
<- [mailto:www-rdf-logic-request@w3.org]On Behalf Of Andrew Hill
<- Sent: 03 May 2001 22:25
<- To: Jan Grant; Seth Russell
<- Cc: Danny Ayers; Www-Rdf-Logic; RDF-Interest
<- Subject: RE: relational mapping?
<-
<-
<- On a related note, Virtuoso http://www.openlinksw.com/virtuoso/
<- can produce
<- XML docs in realtime from local relational tables (within the Virtuoso
<- database) or remote relational data (including heterogenous joins across
<- multiple databases).  The DTD or XMLSchema can be automatically
<- generated or
<- explicitly defined, and there is a built in XSLT processor as
<- well, so you
<- can transform the XML to whatever format you like.
<-
<- Let me know if you have any questions.
<-
<- Hope this helps!
<-
<- Best regards,
<- Andrew
<- --------------------------------------
<- Andrew Hill - OpenLink Software
<- Director Technology Evangelism
<- Universal Data Access Integration
<- http://www.openlinksw.com
<-
<-
<- > -----Original Message-----
<- > From: www-rdf-interest-request@w3.org
<- > [mailto:www-rdf-interest-request@w3.org]On Behalf Of Jan Grant
<- > Sent: Thursday, May 03, 2001 12:08 PM
<- > To: Seth Russell
<- > Cc: Danny Ayers; Www-Rdf-Logic; RDF-Interest
<- > Subject: Re: relational mapping?
<- >
<- >
<- > On Thu, 3 May 2001, Seth Russell wrote:
<- >
<- > > From: "Jan Grant" <Jan.Grant@bristol.ac.uk>
<- > >
<- > > > On Thu, 3 May 2001, Danny Ayers wrote:
<- > > >
<- > > > > Has anyone come across a mapping of the relational model
<- to RDF? I'm
<- > > sure
<- > > > > there's a pretty direct one possible at a low level (tuple
<- > to tuple I
<- > > > > suppose), but it'll save me some thought and a lot of time
<- > if someone's
<- > > > > already looked into this. Alternatively, if there's an RDFS
<- > around that
<- > > > > contains RDBMS terms (schema, table, column etc) I'd very
<- > much like to
<- > > hear
<- > > > > about it. I'm wanting to operate at this latter level, but
<- > it would be
<- > > nice
<- > > > > to be on firm foundations.
<- > > >
<- > > > I've done quite a bit of thinking about it; got some paper
<- notes which
<- > > > I'm in the (slow) process of typing up. You're right,
<- there's a simple
<- > > > mechanical mapping of rows in a table to RDF; what you
<- lose by this is
<- > > > the natural linking of properties.
<- > > >
<- > > > For a sufficiently normalised relational schema*, you can generally
<- > > > produce a mapping
<- > > > (primary key) -> resource
<- > > > (other values) -> properties
<- > > > (foreign key) -> link to resource representing primary key for
<- > > > foreign table
<- > > >
<- > >
<- > > No doubt you are aware of the list of these recorded at [1], to
<- > which list I
<- > > have added the structure diagrammed at [2].
<- > >
<- > > [1] http://www-db.stanford.edu/~melnik/rdf/db.html
<- > > [2] http://robustai.net/mentography/SemStructure.gif
<- >
<- > Neat; but these seem to be "storing RDF in RDBMS" as opposed to
<- > "producing RDF from a (legacy?) RDBMS"
<- >
<- > --
<- > jan grant, ILRT, University of Bristol. http://www.ilrt.bris.ac.uk/
<- > Tel +44(0)117 9287163 Fax +44 (0)117 9287112 RFC822
<- jan.grant@bris.ac.uk
<- > "Sufficiently large"="infinite" for sufficiently large values of
<- > "sufficiently"
<- >
<- >
<-
Received on Thursday, 3 May 2001 14:51:57 UTC

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