AGReasoningSameAs.java

package com.franz.agbase.examples;

import com.franz.agbase.*;

public class AGReasoningSameAs {

    /**
     * Demonstrates reasoning involving owl:sameAs
     * 
     * @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);
        }
        // Create fresh triple-store for this example.
        AllegroGraph ts = ags.renew("sameas", AGPaths.TRIPLE_STORES);
        
        // Register your namespaces
        ts.registerNamespace("ex","http://example.org/");
        
        // Add some triples to the store
        ts.addStatement("!ex:a","!owl:sameAs", "!ex:b");
        ts.addStatement("!ex:b","!owl:sameAs", "!ex:c");
        ts.addStatement("!ex:c","!ex:p", "!ex:d");
        
        // Retrieve some triples without reasoning 
        TriplesIterator cc = ts.getStatements(false,"!ex:a",null,"!ex:c");
        System.out.println("Ground triples relating ex:a and ex:c (should be none):");
        AGUtils.showTriples(cc);

        // Now demonstrate reasoning
        cc = ts.getStatements(true,"!ex:a",null,"!ex:c");
        System.out.println("Infer triples relating ex:a and ex:c");
        AGUtils.showTriples(cc);
        cc = ts.getStatements(true,"!ex:a",null,"!ex:d");
        System.out.println("Infer triples relating ex:a and ex:d");
        AGUtils.showTriples(cc);

        // Add some more triples to the store
        ts.addStatement("!ex:jans","!ex:owns","!ex:birra");  
        ts.addStatement("!ex:jans","!owl:sameAs","!ex:jannes");  
        ts.addStatement("!ex:aasman","!owl:sameAs","!ex:jannes");  
        ts.addStatement("!ex:birra","!owl:sameAs","!ex:son-of-samira");  

        // Now demonstrate more reasoning
        cc = ts.getStatements(true,"!ex:aasman",null,"!ex:son-of-samira");
        System.out.println("Infer triples relating ex:aasman and ex:son-of-samira");
        AGUtils.showTriples(cc);

        // Close the triple store and disconnect from the server.
        ts.closeTripleStore();
        ags.disable();
    }

}

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