- From: Tomasz Pluskiewicz <tomasz.pluskiewicz@gmail.com>
- Date: Wed, 25 Jul 2012 16:05:12 +0200
- To: Juan Sequeda <juanfederico@gmail.com>
- Cc: David McNeil <dmcneil@revelytix.com>, public-rdb2rdf-comments@w3.org
Hello again. Sorry to revive an old topic, but I have recenlty realized the root of my question. The R2RML specs at http://www.w3.org/TR/r2rml/#dfn-term-map state clearly that "A term map must be exactly one of the following: a constant-valued term map, a column-valued term map, a template-valued term map." Doesn't this mean that a term map <StudentsTriplesMap> rr:subjectMap [ rr:termType rr:BlankNode; rr:class <http://example.com/Student> ]; is in fact invalid, having no explicit rr:constant, rr:column or rr:template property? Regards, Tomasz On Fri, Jun 8, 2012 at 10:19 PM, Tomasz Pluskiewicz <tomasz.pluskiewicz@gmail.com> wrote: > Thank you for answering. Also, let me answer here again. > > I forgot to mention I intended the mapping as default mapping for > table without primary key. > > In my oppinion by default direct mapping should generate a blank node > for each row. And I do have mixed feelings about the behavior not > preserving duplicate rows. > > Regards, > Tomasz > > On Fri, Jun 8, 2012 at 6:26 PM, Juan Sequeda <juanfederico@gmail.com> wrote: >> I asked on the forum, but let me ask here. >> >> are you expecting the R2RML engine to generate a blank node for each tuple, >> or do you have a column value that you would like to use in order to >> generate the blank node? >> >> Juan Sequeda >> +1-575-SEQ-UEDA >> www.juansequeda.com >> >> >> >> On Fri, Jun 8, 2012 at 9:22 AM, David McNeil <dmcneil@revelytix.com> wrote: >>> >>> >From the latest R2RML draft: >>> >>> * a subject map is a term map, >>> http://www.w3.org/2001/sw/rdb2rdf/r2rml/#dfn-term-map >>> >>> * the termType property can be used on term maps, >>> http://www.w3.org/2001/sw/rdb2rdf/r2rml/#termtype >>> >>> So "yes", you can use termType on subject maps and this is how you would >>> produce subjects as blank nodes. >>> >>> -David >> >>
Received on Wednesday, 25 July 2012 14:06:30 UTC