I have one RDF file for a student and another for his school. I wold like to perform a sparql query that will check the conditions and fetch information from both the RDF files. Currently I am using Jena server to query single RDF file and easely able to query. Please suggest me some tool to join or concatenate or combine multiple RDF files and query them using sparql.
Hi Anuj,
I think you can use RDF storage like sesame, Virtuoso or stardog etc to store triplet and fire SPARQL query on stored RDF files.
I would suggest to use FedEx for federated query we have engine called SAFE for query federation would be happy to share.
you can use prefix
for example for my project that is semantic web services for e-Customs:
different prefixes:
sho= " PREFIX sho: ";
private final String cus= " PREFIX cus: ";
SH-Nmct.owl and CustomsOntology.owl are two different RDF files.
and my query is like that:
String queryString =
rdfs+sho+cus
+"SELECT ?code ?design "
+"WHERE {"
+"cus:"+ind+" cus:hasClassification ?classification."
+ "?classification sho:Code ?code."
+"?classification sho:Designation ?design ."
+"}";
Hi there,
These are called "federated queries" - please find more information here: http://www.w3.org/TR/sparql11-federated-query/
Assuming these are actual distributed "files" (without available SPARQL endpoints but located somewhere on the web), then you can use comunica (https://github.com/comunica/comunica) Also there is SparqlAnything (https://sparql-anything.readthedocs.io/en/latest/#query-static-rdf-files) which supports non-rdf formats e.g. JSON, CSV, BibTex...
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