# AGNamespaceRegistries.java

`package com.franz.agbase.examples;
import com.franz.agbase.*;
public class AGNamespaceRegistries {
/**
* Demonstrates some basic facts and use of namespace registries.
*
* @param args unused
* @throws AllegroGraphException
*/
public static void main(String[] args) throws AllegroGraphException {
// Connect to server, which must already be running.
AllegroGraphConnection ags = new AllegroGraphConnection();
try {
ags.enable();
} catch (Exception e) {
throw new AllegroGraphException("Server connection problem", e);
}
// Show the namespace definitions registered with the server
AGUtils.printStringArray("AGS Namespaces (initially):",ags.getNamespaces());
// Create a fresh triple-store.
AllegroGraph ts = ags.renew("namespaces", AGPaths.TRIPLE_STORES);
// Show the namespace definitions available to this triple store
// Each triple store maintains its own namespaces initialized by server namespaces
AGUtils.printStringArray("TS Namespaces (initially):",ts.getNamespaces());
// Add a namespace to the server's namespace registry
// (future triple store namespaces will be initialized with it)
ags.registerNamespace("ns1", "http://www.example.com/ns1#");
// Add a namespace to the triple store's registry
ts.registerNamespace("ns2", "http://www.example.com/ns2#");
// Show the namespaces registered with the server and the triplestore
AGUtils.printStringArray("AGS Namespaces (added ns1):",ags.getNamespaces());
AGUtils.printStringArray("TS Namespaces: (added ns2)",ts.getNamespaces());
// Redefine a namespace
ts.registerNamespace("ns1", "http://www.example.com/ns1a#");
// Remove a namespace
ts.registerNamespace("ns2", null);
// Show the namespace definitions for the triplestore
AGUtils.printStringArray("TS Namespaces: (redefined ns1, removed ns2)",ts.getNamespaces());
// Close the store and disconnect from the server.
ts.closeTripleStore();
ags.disable();
}
}
`

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