Hi Paul
You can join results from different endpoints using the SERVICE clause of
sparql 1.1.
I also invite you to know the SPARQLfederator project, which turns a
conjunctive query into a regular sparql query automatically unifying
diferent endpoints :
https://github.com/djogopatrao/SPARQLFederator
Other tool you may look is fedx.
Cheers
Dfcp
Em 26/02/2015 07:36, "Richard Cyganiak" <rich...@cyganiak.de> escreveu:
> Hi Paul,
>
> A quick initial response.
>
> Even though D2RQ is made for directly querying a relational DB with
> SPARQL, if you need to integrate data from multiple sources, I recommend
> dumping them all to RDF and loading them into a single RDF store. This is
> the best way to get performance and reliability. Of course, it may not be
> possible for you due to database size or quickly changing data.
>
> The D2RQ assembler works for me with the version of Joseki that ships with
> D2RQ, Joseki 3.4.4.
>
> I’m not sure what you mean by “external assembler file.” Can you explain
> or give an example?
>
> Best,
> Richard
>
>
> > On 25 Feb 2015, at 02:53, Paul Murray <pmur...@anbg.gov.au> wrote:
> >
> > I hope this list is still live.
> >
> > I am attempting to union a d2rq model to some data in TDB (and some
> static RDF files). The effect that I am trying to achieve is to add our new
> database to the data available at http://biodiversity.org.au/sparql/ .
> The TDB data there contains legacy identifiers. Our new database has
> mappings for these old IDs, so If I can jam the while lot into a single big
> graph, then it should be possible to span the data with SPARQL.
> >
> > To keep things organised, I am putting the different data sets into
> named graphs. I don't see that the d2r server does this at all.
> >
> > I have tried a variety of things - I run into class version problems,
> incompatible interfaces, various other things. I'm at the stage of thinking
> that I need to hack up the d2r code and rewrite SystemLoader, rigging it
> up to return a Graph that is not the d2r graph but that has that d2r graph
> as a subgraph. I have found that if I change the declaration of
> getModelD2RQ and getGraphD2RQ to return just the interface type, none of
> the existing code complains - but the point is that I shouldn't have to do
> this: there is a d2r jana assembler and it should just work.
> >
> > So:
> >
> > * Is there a version of fuseki/joseki that the d2rq assembler is known
> to work with?
> > Alternatively:
> > * can I launch the d2r server with an external assembler file?
> >
> > ---------------
> > If you are curious about the existing data, try this SPARQL query on
> http://biodiversity.org.au/sparql/ . (If you explore our data, please add
> a limit clause to all your sparql)
> >
> > prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
> > prefix dcterms: <http://purl.org/dc/terms/>
> > prefix g: <http://biodiversity.org.au/voc/graph/GRAPH#>
> >
> > select ?label ?title ?desc ?uri
> > where {
> > graph g:meta {
> > ?uri a g:GraphURI .
> > OPTIONAL { ?uri rdfs:label ?label } .
> > OPTIONAL { ?uri dcterms:title ?title } .
> > OPTIONAL { ?uri dcterms:description ?desc } .
> > }
> > }
> > ORDER BY ?uri
> > LIMIT 100
> >
> >
> >
> >
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