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Re: RDF-ISSUE-17 (graph merge): How are RDF datasets to be merged? [RDF Graphs]

From: Nathan <nathan@webr3.org>
Date: Mon, 28 Mar 2011 17:15:52 +0100
Message-ID: <4D90B438.9000604@webr3.org>
To: Yves Raimond <Yves.Raimond@bbc.co.uk>
CC: RDF Working Group WG <public-rdf-wg@w3.org>
would it be needed? if we can union instead of merge, then surely we can 
do intersections, differences and all the rest without a problem?

Yves Raimond wrote:
> Could we bundle graph diffs in that issue as well?
> 
> Best,
> y
> 
> On Mon, Mar 28, 2011 at 03:07:20PM +0000, RDF Working Group Issue Tracker wrote:
>> RDF-ISSUE-17 (graph merge): How are RDF datasets to be merged? [RDF Graphs]
>>
>> http://www.w3.org/2011/rdf-wg/track/issues/17
>>
>> Raised by: David Wood
>> On product: RDF Graphs
>>
>> 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.
>>
>>
>>
>>
> 
> 
> 
Received on Monday, 28 March 2011 16:16:41 UTC

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