# AGFederationSparqlReasoning.java

`package com.franz.agbase.examples;
import com.franz.agbase.*;
public class AGFederationSparqlReasoning {
/**
* Demonstrates SPARQL over a federation with and without reasoning.
*
* @param args unused
* @throws AllegroGraphException
*/
public static void main(String[] args) throws AllegroGraphException {
// Connect to the default server, which must already be running.
AllegroGraphConnection ags = new AllegroGraphConnection();
try {
ags.enable();
} catch (Exception e) {
throw new AllegroGraphException("Server connection problem.", e);
}
// Register namespaces
// Future AllegroGraph instances on this connection will get this.
ags.registerNamespace("ex", "http://example.org/");
// Create triple stores for this example
AllegroGraph ts1 = ags.renew("ontology", AGPaths.TRIPLE_STORES);
AllegroGraph ts2 = ags.renew("facts", AGPaths.TRIPLE_STORES);
// Create a federated store consisting of the first 2 open stores above
AllegroGraph[] parts = {ts1,ts2};
AllegroGraph fed = ags.federate("federation", parts, true);
// Add some ontology
ts1.addStatement("!ex:SmallBlackDog","!rdfs:subClassOf","!ex:BlackDog");
ts1.addStatement("!ex:BlackDog","!rdfs:subClassOf","!ex:Dog");
ts1.addStatement("!ex:Dog","!rdfs:subClassOf","!ex:Mammal");
ts1.addStatement("!ex:Giraffe","!rdfs:subClassOf","!ex:Mammal");
ts1.addStatement("!ex:Lion","!rdfs:subClassOf","!ex:Mammal");
ts1.addStatement("!ex:Mammal","!rdfs:subClassOf","!ex:Animal");
// Add some facts
ts2.addStatement("!ex:Abbey","!rdf:type","!ex:BlackDog");
String query =
"PREFIX ex: <http://example.org/>"
+ "PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> "
+ "SELECT ?class "
+ "WHERE { "
+ " ex:Abbey rdf:type ?class . "
+ "}";
// Sparql query over the federation without reasoning
SPARQLQuery sq = new SPARQLQuery();
sq.setTripleStore(fed);
sq.setQuery(query);
sq.setIncludeInferred(false);
AGSparqlSelect.doSparqlSelect(sq);
// Sparql query over the federation with RDFS++ reasoning
sq.setIncludeInferred(true);
AGSparqlSelect.doSparqlSelect(sq);
// Close all stores and disconnect from the server
fed.closeTripleStore();
ts1.closeTripleStore();
ts2.closeTripleStore();
ags.disable();
}
}
`

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