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Re: Blank nodes as subject maps in R2RML

From: Tomasz Pluskiewicz <tomasz.pluskiewicz@gmail.com>
Date: Fri, 8 Jun 2012 22:19:46 +0200
Message-ID: <CAAFOhScKjudb-RnyfRkXsHK3siVH06eYrVrarSftPiOFZJOgzQ@mail.gmail.com>
To: Juan Sequeda <juanfederico@gmail.com>
Cc: David McNeil <dmcneil@revelytix.com>, public-rdb2rdf-comments@w3.org
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.


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 Friday, 8 June 2012 20:20:55 UTC

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