- From: Juan Sequeda <juanfederico@gmail.com>
- Date: Tue, 8 May 2012 11:02:03 -0500
- To: "ashok.malhotra@oracle.com" <ashok.malhotra@oracle.com>
- Cc: RDB2RDF WG <public-rdb2rdf-wg@w3.org>
Running a few minutes late Juan Sequeda www.juansequeda.com On May 8, 2012, at 6:38 AM, ashok malhotra <ashok.malhotra@oracle.com> wrote: > --------------------------------------------------------- > AGENDA Teleconference > W3C RDB2RDF Working Group telephone conference 2012-05-08 > ---------------------------------------------------------- > *16:00-17:00 UTC* > Local time: > > > http://timeanddate.com/worldclock/fixedtime.html?month=05&day=01&year=2012&hour=16&min=00&sec=0 > > > Bridge US: +1-617-761-6200 (Zakim) > Conference code: 7322733# (spells "RDB2RDF") > IRC channel : #RDB2RDF on irc.w3.org:6665 W3C > --------------------------------------------------------- > > > Chair: Ashok > Scribe: ? > > We have only one remaining issue and we need to close that today. Please read the mail > on this issue and be prepared to discuss. > > 1. Admin > > PROPOSAL: Accept the minutes of last meetinghttp://www.w3.org/2012/05/01-RDB2RDF-minutes.html > > 2. Implementability for tables w/o primary key > > +http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2012Apr/0030.html > +http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2012Apr/0036.html > +http://lists.w3.org/Archives/Public/public-rdb2rdf-wg/2012Apr/0019.html > > PROPOSAL A: In the DM spec, replace the following text: > > [[ > If the table has no primary key, the row node is a fresh blank node that is unique to this row. > ]] > > with this: > > [[ > If the table has no primary key, the row node is a blank node. Distinct blank nodes MUST be generated for rows with distinct column values. For duplicate rows with identical values, implementations SHOULD generate a fresh blank for each duplicate row (resulting in a non-lean RDF graph [RDF Semantics]). However, if the underlying database system does not provide any means to reliably differentiate among the rows, then implementations MAY re-use the same blank node for multiple duplicate rows (resulting in a lean RDF graph). Implementations SHOULD document and advertise their chosen behavior. > ]] > > PROPOSAL B. > o In the DM, instead of "is intended to provide a default behavior for R2RML: RDB to RDF Mapping Language" say "is intended to provide a default behavior for R2RML: RDB to RDF Mapping Language for tables which have at least one unique key" > > o Add to the R2RML document (probably in the intro part): "R2RML implementations are encouraged to provide a default mapping equivalent to the Direct Mapping for tables which have at least one unique key" > > o Add a Note to R2RML 6.1: "Because rr:IRI and rr:BlankNode subject labels are generated from column values, R2RML mappings do not preserve repeated rows in SQL databases." > > 3. If we get closure on the above issue, discussion about publication. > > 4. AOB > > > > -- > All the best, Ashok >
Received on Tuesday, 8 May 2012 16:03:03 UTC