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

Regrets for this week and next week due to my summer vacation.

Best regards,

Li Ma
----- 原始邮件 -----
发件人：Michael Hausenblas <michael.hausenblas@deri.org>
收件人：RDB2RDF WG <public-rdb2rdf-wg@w3.org>
主题：RDB2RDF WG agenda for 2010-08-24 meeting 1600 UTC
日期：2010-8-23 20:48:46



All,



Please find below the agenda for tomorrow's meeting (kindly provided by

Ashok, thanks!) - looking forward meeting you all again!



Cheers,

        Michael



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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?



6. AOB



-- 

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