- From: Daniel Miranker <miranker@cs.utexas.edu>
- Date: Tue, 24 Aug 2010 11:22:04 -0500
- To: Michael Hausenblas <michael.hausenblas@deri.org>
- Cc: RDB2RDF WG <public-rdb2rdf-wg@w3.org>
I reviewed the LSID literature as I promised to do. - The LSID literature asserts that identifiers should be "Semantically Opaque", but does not provide any arguments for it. - I come up with the following example per directly embedding database values in URI's: While it is a terrible practice, social-security numbers are often used as primary keys. Clearly, there must be an alternative to embedding these in URIs. - OMG no longer freely provides the LSID spec. so I didn't up load a pointer to the Wiki If anyone is interested, I'll send you my copy. - FYI, much of the LSID literature was written by Ben Szekely, who used to be part of the RDB2RDF working group. Dan On Aug 23, 2010, at 7:48 AM, Michael Hausenblas 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? > > 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 > >
Received on Tuesday, 24 August 2010 16:18:10 UTC