- From: Alexandre Bertails <bertails@w3.org>
- Date: Wed, 06 Jul 2011 09:26:32 -0400
- To: Kingsley Idehen <kidehen@openlinksw.com>
- Cc: public-rdb2rdf-wg@w3.org
On Wed, 2011-07-06 at 13:25 +0100, Kingsley Idehen wrote: > On 7/6/11 1:11 PM, RDB2RDF Working Group Issue Tracker wrote: > > ISSUE-48 (sql-datatypes): Mapping SQL datatypes to RDF > > > > http://www.w3.org/2001/sw/rdb2rdf/track/issues/48 > > > > Raised by: Richard Cyganiak > > On product: > > > > Neither R2RML nor the Direct Mapping currently specify how exactly SQL types are mapped to RDF. > > > > To address this, a careful comparison of standard SQL types and XSD types is required. > > > > Part of this problem is the question of vendor-specific types. Most databases use vendor-specific types. Their treatment (even if it is: ignore these columns) has to be specified. > > > > > > > > > > A little clearer: > > Map ANSI SQL Types to XSD Types. > > Stay away from the vendor specific stuff. Leave those implementing R2RML > to handle DBMS vendor SQL type mapping to ANSI SQL and from there to XSD > types. > I agree it's gonna be difficult (if possible) to map any SQL datatype. But some datatypes are available everywhere. These should be part of the Direct Mapping. Alexandre.
Received on Wednesday, 6 July 2011 13:26:21 UTC