ISSUE-44: Duplicate quads generated by TriplesMaps

duplicate quads

Duplicate quads generated by TriplesMaps

State:

CLOSED

Product:

R2RML

Raised by:

David McNeil

Opened on:

2011-05-31

Description:

As far as I can see the R2RML spec does not describe the proper behavior in the case where TriplesMaps produce identical quads. I think a couple of sentences should be added to the spec to specifically say what should happen in this case.

My understanding of the correct behavior is:
* R2RML maps are to produce SPARQL RDF datasets.
* SPARQL RDF datasets contain a collection of RDF graphs (many named and one default).
* RDF graphs are sets of triples.
* As "sets", RDF graphs do not contain duplicate triples.
* Therefore SPARQL RDF datasets do not contain duplicate quads.
* Therefore R2RML maps should not produce duplicate quads.

In particular looking forward to SPARQL 1.1 aggregates I believe this is important to specify.

Note, SPARQL queries run against the quads produced by an R2RML map can produce duplicate tuples.

Related Actions Items:

No related actions

Related emails:

1. Minutes of 2011-07-12 telecon (from michael.hausenblas@deri.org on 2011-07-12)
2. Re: Agenda for July 12 Telcon (from michael.hausenblas@deri.org on 2011-07-12)
3. Re: Agenda for July 12 Telcon (from juanfederico@gmail.com on 2011-07-12)
4. Re: Agenda for July 12 Telcon (from privera.salas@gmail.com on 2011-07-12)
5. Re: Agenda for July 12 Telcon (from marcelo.arenas1@gmail.com on 2011-07-12)
6. Agenda for July 12 Telcon (from ashok.malhotra@oracle.com on 2011-07-09)
7. Re: Agenda for June 28 Telcon (Today) (from richard@cyganiak.de on 2011-06-28)
8. Re: Housekeeping on open/raised issues, with PROPOSAL (from dmcneil@revelytix.com on 2011-06-21)
9. Housekeeping on open/raised issues, with PROPOSAL (from richard@cyganiak.de on 2011-06-21)
10. Re: ISSUE-44 (duplicate quads): Duplicate quads generated by TriplesMaps [R2RML] (from dmcneil@revelytix.com on 2011-05-31)
11. Re: ISSUE-44 (duplicate quads): Duplicate quads generated by TriplesMaps [R2RML] (from richard@cyganiak.de on 2011-05-31)
12. ISSUE-44 (duplicate quads): Duplicate quads generated by TriplesMaps [R2RML] (from sysbot+tracker@w3.org on 2011-05-31)

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