Re: RDB2RDF WG agenda for 2010-08-24 meeting 1600 UTC

* Marcelo Arenas <marcelo.arenas1@gmail.com> [2010-08-23 14:46-0400]
> Dear All,
> 
> On Mon, Aug 23, 2010 at 8:48 AM, Michael Hausenblas
> <michael.hausenblas@deri.org> wrote:
> >
> > All,
> >
> > Please find below the agenda for tomorrow's meeting (kindly provided by
> > Ashok, thanks!) - looking forward meeting you all again!
> >
> > Cheers,
> >        Michael
> >
> > ---------------------------------------------------------
> > AGENDA Teleconference
> > W3C RDB2RDF Working Group telephone conference 2010-08-24
> > ----------------------------------------------------------
> > Tuesday, 24 August *16:00-17:00 UTC* Local time:
> > http://www.timeanddate.com/worldclock/fixedtime.html?month=08&day=24&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
> >
> > 0. Scribe assignment
> >
> > 1. Admin PROPOSAL: Accept the minutes of last meeting, see
> > http://www.w3.org/2010/08/17-rdb2rdf-minutes.html
> >
> > 2. Conclude discussion on comments on SQL-based approach from Richard
> > Cyganiak
> > - http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2010Aug/0004.html
> > Richard was not on the call last week.
> > We discussed his Section 3 comments
> > There was discussion on URI Templates
> > Souri also had a question on large Lookup Tables see below.
> > There was discussion about the dangers of SQL injection
> >
> > 3. Revised proposal from Souri
> > http://www.w3.org/2001/sw/rdb2rdf/wiki/An_XML_Schema_for_SQL-based_RDB2RDF_M
> > apping_%28Revision_1%29
> >
> > http://www.w3.org/2001/sw/rdb2rdf/wiki/Example_of_SQL-based_RDB2RDF_Mapping:
> > _Revision_1
> >
> > Souri's comment:
> > Regarding Comment 2.5 (Lookup Table): How can we translate a SPARQL
> > query with FILTER involving transformed values?
> >
> >  Example: Consider the following SPARQL query involving a property,
> > :transfProp, whose values are transformed, via a lookup table, into (-1)
> > times the original value
> >      (e.g., 10 in an INTEGER column, i.e., "10"^^xsd:integer in RDF, is
> > transformed into "-10"^^xsd:integer):
> >
> >      SELECT ?x ?y WHERE {?x  :transfProp ?v1 . ?y   :transfProp  ?v2 .
> > FILTER (?v1 > ?v2)}
> >
> >       How can SQL know, without having the lookup table somehow
> > specified (in a CASE statement or something equivalent), how to evaluate
> > the FILTER clause?
> >
> > 4. Discussion on next steps for SQL-based approach.   Create FPWD?
> >
> > 5. What are we going to do about the Default Mapping?  Separate document?
> > Who can start a document for discussion?  Juan, Eric, Souri?
> 
> We discuss the issue about the Default Mapping with Juan, and we think
> that our approach can be integrated with Eric's document. This week we
> will generate a document with the syntax and semantics of the default
> mapping based on Datalog. When Eric's default mapping is ready, we
> would like to show how to express it in the Datalog-based language.

That'd be cool. I tested the type-consistency with a scala implementation
  https://dvcs.w3.org/hg/stemGraph/file/5653130b620a/src/main/scala/Main.scala
  https://dvcs.w3.org/hg/stemGraph/file/5653130b620a/src/test/scala/Test.scala
. I doubt that's helpful to you, but thought I'd throw it your way just
in case.


> All the best,
> 
> Marcelo
> 

-- 
-ericP

Received on Monday, 23 August 2010 20:21:20 UTC