Direct Mapping

All,


> > >
> > The outcome of a direct mapping is going to the be a mapping, written in
> a
> > syntax... which we have not defined yet.
>
> As I understand it, a direct mapping just has to define an RDF graph
> in terms of an input relational database; that it doesn't have any
> dependency on r2ml.
>

A RDB2RDF system with a R2RML file will always define a RDF graph.

So what makes the direct mapping different?

They way I see it, is that the R2RML file is generated automatically, and
with this file, given a RDB2RDF system, you will have a RDF graph. If other
see it different (I can tell that Eric does), then please shout out.

The automatic mapping file that is generated in D2R is equivalent to the
Direct Mapping (right Richard?). We will just be presenting the
"standardized" way of doing it and the the D2R folks will need to change
some stuff in the mapping file that they generate automatically.


>
> >  We need to make more progress on the syntax before we continue with the
> > direct mapping. I'm still working with Marcelo and bridging what Eric has
> > written with the formal semantics of datalog.
>
> The datalog definition would be cool 'cause we could exercise it in
> e.g. SWI prolog. I can sketch something up in a functional syntax as
> well.
>

You don't have to go to all the way to Prolog. You can use also datalog-rule
engines such as Jess, Drools. That's the way we do it in Ultrawrap :P


>
> > > > I'm surprised there hasn't been any discussion on this topic this
> week.
> > > >
> > > > It seems that we have three proposals on the table. What are we going
> to
> > > do?
> > > > Consolidate them in one document? Vote for one?
> > > >
> > > >
> > > > Juan Sequeda
> > > > +1-575-SEQ-UEDA
> > > > www.juansequeda.com
> > > >
> > > >
> > > > On Mon, Sep 6, 2010 at 10:18 AM, Michael Hausenblas <
> > > > michael.hausenblas@deri.org> wrote:
> > > >
> > > > > All,
> > > > >
> > > > > Below the agenda for tomorrow's meeting, looking forward to resolve
> one
> > > or
> > > > > two issues ;)
> > > > >
> > > > > Cheers,
> > > > >        Michael
> > > > >
> > > > > ---------------------------------------------------------
> > > > > AGENDA Teleconference
> > > > > W3C RDB2RDF Working Group telephone conference 2010-09-07
> > > > > ----------------------------------------------------------
> > > > > Tuesday, 9 September *16:00-17:00 UTC* Local time:
> > > > >
> > > > >
> > >
> http://www.timeanddate.com/worldclock/fixedtime.html?month=09&day=07&year=20
> > > > > 10&hour=16&min=00&sec=0
> > > > > Bridge US: +1-617-761-6200 (Zakim) Conference code : 7322733#
> (spells
> > > > > "RDB2RDF")
> > > > > Duration : 60 minutes
> > > > > -------------------------------------------------------------------
> > > > > IRC channel : #RDB2RDF on irc.w3.org:6665 W3C IRC Web Client :
> > > > > http://www.w3.org/2001/01/cgi-irc
> > > > > Zakim information : http://www.w3.org/2002/01/UsingZakim
> > > > > Zakim bridge monitor : http://www.w3.org/1998/12/bridge/Zakim.html
> > > > > Zakim IRC bot : http://www.w3.org/2001/12/zakim-irc-bot.html
> > > > > -------------------------------------------------------------------
> > > > >
> > > > > Chair: Michael
> > > > > Scribe: Zakim, pick a victim
> > > > >
> > > > >
> > > > > 1. Admin PROPOSAL: Accept the minutes of last meeting, see
> > > > > http://www.w3.org/2010/08/31-rdb2rdf-minutes.html
> > > > >
> > > > > 2. What are we going to do about the Default Mapping?
> > > > > Juan, any news?
> > > > >
> > > > > 3. Syntax discussion
> > > > > See post from Richard and follow-ups on mailing list
> > > > >
> > >
> http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2010Aug/0038.html
> > > > >
> > > > > Options are:
> > > > >
> > > > >  + custom syntax
> > > > >
> > >
> http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2010Aug/0055.html
> > > > >
> > > > >  + RDF/Turtle
> > > > >   http://www.w3.org/2001/sw/rdb2rdf/wiki/R2RML_in_Turtle
> > > > >
> > > > >  + XML
> > > > >
> > > > >
> > >
> http://www.w3.org/2001/sw/rdb2rdf/wiki/Example_of_SQL-based_RDB2RDF_Mapping
> > > > > :_Revision_1
> > > > >
> > > > >
> > > > > 4. AOB
> > > > >
> > > > >
> > > > > Cheers,
> > > > >      Michael
> > > > >
> > > > > --
> > > > > Dr. Michael Hausenblas
> > > > > LiDRC - Linked Data Research Centre
> > > > > DERI - Digital Enterprise Research Institute
> > > > > NUIG - National University of Ireland, Galway
> > > > > Ireland, Europe
> > > > > Tel. +353 91 495730
> > > > > http://linkeddata.deri.ie/
> > > > > http://sw-app.org/about.html
> > > > >
> > > > >
> > > > >
> > > > >
> > >
> > > --
> > > -ericP
> > >
>
> --
> -ericP
>