ISSUE-17: How are RDF datasets to be merged?

graph merge

How are RDF datasets to be merged?

State:

CLOSED

Product:

RDF Graphs

Raised by:

David Wood

Opened on:

2011-03-28

Description:

The "RDF Semantics" spec defines how to merge two or more RDF graphs,
the pain is caused by blank nodes, otherwise it's a trivial operation.

The "SPARQL Query Language for RDF" spec defines the notion of RDF
dataset as a set of "one graph, the default graph, which does not have
a name, and zero or more named graphs, where each named graph is
identified by an IRI".

How do we define how to merge RDF datasets?

One obvious answer is we merge all the default graphs and all the
named graphs with the same IRI using the procedure defined by the "RDF
Semantics" to merge RDF graphs.

NB: This issue will also relate to the "Cleanup Tasks" product if the RDF Semantics document will need to change in relation to named graphs.

At Talis, within the Talis Platform, we want to enable people to
easily merge RDF graphs into an RDF dataset and perhaps RDF datasets
into another RDF dataset. We also want to have these merge happen in
real-time (i.e. as you add/remove triples from the graphs you update
all the derived graphs/datasets).

Thanks to Paolo Castagna of Talis for providing input to this issue.

Related Actions Items:

No related actions

Related emails:

1. RE: second review of json-ld (from markus.lanthaler@gmx.net on 2013-04-01)
2. Re: second review of json-ld (from andy.seaborne@epimorphics.com on 2013-03-29)
3. RE: second review of json-ld (from markus.lanthaler@gmx.net on 2013-03-29)
4. Re: second review of json-ld (from gregg@greggkellogg.net on 2013-03-29)
5. second review of json-ld (from sandro@w3.org on 2013-03-29)
6. Re: Comments on RDFa Core 1.1 Working Draft (from pierre-antoine.champin@liris.cnrs.fr on 2012-01-12)
7. Re: Comments on RDFa Core 1.1 Working Draft (from andy.seaborne@epimorphics.com on 2012-01-11)
8. Re: Comments on RDFa Core 1.1 Working Draft (from ivan@w3.org on 2012-01-11)
9. Re: Comments on RDFa Core 1.1 Working Draft (from andy.seaborne@epimorphics.com on 2012-01-11)
10. Comments on RDFa Core 1.1 Working Draft (from david@3roundstones.com on 2012-01-11)
11. Re: RDF-ISSUE-17 (graph merge): How are RDF datasets to be merged? [RDF Graphs] (from axel.polleres@deri.org on 2011-03-29)
12. Re: RDF-ISSUE-17 (graph merge): How are RDF datasets to be merged? [RDF Graphs] (from steve.harris@garlik.com on 2011-03-29)
13. Re: RDF-ISSUE-17 (graph merge): How are RDF datasets to be merged? [RDF Graphs] (from andy.seaborne@epimorphics.com on 2011-03-28)
14. Re: RDF-ISSUE-17 (graph merge): How are RDF datasets to be merged? [RDF Graphs] (from nathan@webr3.org on 2011-03-28)
15. Re: RDF-ISSUE-17 (graph merge): How are RDF datasets to be merged? [RDF Graphs] (from Yves.Raimond@bbc.co.uk on 2011-03-28)
16. Re: RDF-ISSUE-17 (graph merge): How are RDF datasets to be merged? [RDF Graphs] (from nathan@webr3.org on 2011-03-28)
17. Re: RDF-ISSUE-17 (graph merge): How are RDF datasets to be merged? [RDF Graphs] (from Yves.Raimond@bbc.co.uk on 2011-03-28)
18. RDF-ISSUE-17 (graph merge): How are RDF datasets to be merged? [RDF Graphs] (from sysbot+tracker@w3.org on 2011-03-28)

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