On 16/01/2019 15:50, Svensson, Lars wrote:
On Wednesday, January 16, 2019 4:17 PM, ajs6f [mailto:aj...@apache.org] wrote:
I'm not quite sure what's going on here. It looks like you are trying to load
entire
datasets as named graphs in another dataset, but that doesn't make any sense.
Datasets contain graphs. You can't shove an entire dataset into a graph.
Are you trying to extract a particular graph from each of these datasets to
insert into
another?
Perhaps you can tell us a bit more about what you are trying to accomplish
here, and
we can help you find out how to do that.
My use case is that I have some (fairly large) RDF files (in n-triples) that I
want to expose through Fuseki.
The contents of each file must be in its own named graph.
Fine - each NG ina database can be loaded separately.
I also want the default graph to be the union of all the named graphs.
So far I have loaded each RDF file into its own TDB2 store, but if I understand
you correctly that is the wrong approach...
Not wrong ... I wanted to understand the situation and see if a simpler
setup meet your needs. In my example I put them all in one DB to get the
union - the RDFDataset means that the visible dataset is those named
graph and maybe some non-TDB2 ones.
Andy
Thanks,
Lars
On Jan 16, 2019, at 4:25 AM, Svensson, Lars <l.svens...@dnb.de> wrote:
Greetings,
I have several TDB2 datasets that I want to expose as named graphs and as a
joint dataset. My basic idea is to have each TDB2 dataset as its own graph and
then
a joint dataset combining all graphs with the default graph being the union of
all
named graphs. My configuration is:
@prefix fuseki: <http://jena.apache.org/fuseki#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix tdb2: <http://jena.hpl.hp.com/2016/tdb#> .
@prefix ja: <http://jena.hpl.hp.com/2005/11/Assembler#> .
@prefix : <#> .
<#service1> rdf:type fuseki:Service ;
fuseki:name "/dnb" ; # http://host:port/dnb
fuseki:serviceQuery "query" ; # SPARQL query service
fuseki:serviceReadGraphStore "data" ; # SPARQL Graph store protocol
(read only)
fuseki:dataset <#dnb> ;
.
<#dnb> a ja:RDFDataset ;
tdb2:unionDefaultGraph true ;
ja:namedGraph [
ja:graphName <https://d-nb.info/datasets/authorities#dataset> ;
ja:graph <#authorities>
];
ja:namedGraph [
ja:graphName <https://d-nb.info/datasets/bib#dataset> ;
ja:graph <#bib>
];
ja:namedGraph [
ja:graphName <https://d-nb.info/datasets/dnb-all#dataset> ;
ja:graph <#dnb-all>
];
ja:namedGraph [
ja:graphName <https://d-nb.info/datasets/zdb#dataset> ;
ja:graph <#zdb>
];
.
<#authorities> a tdb2:GraphTDB ;
tdb2:dataset <#dataset-authorities> .
<#bib> a tdb2:GraphTDB ;
tdb2:dataset <#dataset-bib> .
<#dnb-all> a tdb2:GraphTDB ;
tdb2:dataset <#dataset-dnb-all> .
<#zdb> a tdb2:GraphTDB ;
tdb2:dataset <#dataset-zdb> .
<#dataset-authorites> a tdb2:DatasetTDB ;
tdb2:location "/home/svensson/fuseki-data/dnb/authorities/" .
<#dataset-bib> a tdb2:DatasetTDB ;
tdb2:location "/home/svensson/fuseki-data/dnb/bib/" .
<#dataset-dnb-all> a tdb2:DatasetTDB ;
tdb2:location "/home/svensson/fuseki-data/dnb/dnb-all/" .
<#dataset-zdb> a tdb2:DatasetTDB ;
tdb2:location "/home/svensson/fuseki-data/dnb/zdb/" .
When I start Fuseki, I get the following error message:
[2019-01-15 11:14:13] Server ERROR Exception in initialization: the root
file:///home/svensson/apache-jena-fuseki-
3.10.0/run/configuration/service1.ttl#authorities has no most specific type
that is a
subclass of ja:Object
[2019-01-15 11:14:13] WebAppContext WARN Failed startup of context
o.e.j.w.WebAppContext@46044faa{Apache Jena Fuseki
Server,/,file:///home/svensson/apache-jena-fuseki-3.10.0/webapp/,UNAVAILABLE}
org.apache.jena.assembler.exceptions.NoSpecificTypeException: the root
file:///home/svensson/apache-jena-fuseki-
3.10.0/run/configuration/service1.ttl#authorities has no most specific type
that is a
subclass of ja:Object
doing:
root: file:///home/svensson/apache-jena-fuseki-
3.10.0/run/configuration/service1.ttl#dnb with type:
http://jena.hpl.hp.com/2005/11/Assembler#RDFDataset assembler class: class
org.apache.jena.sparql.core.assembler.DatasetAssembler
Have I missed something obvious?
Thanks in advance,
Lars
