AGPrologFunctorQ.java

package com.franz.ag.examples;



import com.franz.ag.*;



public class AGPrologFunctorQ {



    /**

     * Demonstrates RDFS++ reasoning from within Prolog using functor q

     * 

     * @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 a fresh triple-store for this example.

        AllegroGraph ts = ags.renew("functorq", AGPaths.TRIPLE_STORES);

        

        // Register your namespaces

        ts.registerNamespace("ex","http://example.org/");

        

        // Add some triples to the store

        ts.addStatement("!ex:a","!ex:owned-by","!ex:b");

        ts.addStatement("!ex:c","!ex:owns","!ex:d");

        ts.addStatement("!ex:jans","!ex:owns","!ex:birra");

        ts.addStatement("!ex:owned-by","!owl:inverseOf","!ex:owns");



        // First a query without reasoning using functor q- 

        String pquery = "(?x ?y) (q- ?x !ex:owns ?y)";

        AGUtils.doPrologQuery(ts, pquery);



        // Now demonstrate reasoning with functor q

        pquery = "(?x ?y) (q ?x !ex:owns ?y)";

        AGUtils.doPrologQuery(ts, pquery);



        // Add some more triples to the store

        ts.addStatement("!ex:A","!rdfs:subClassOf", "!ex:B");

        ts.addStatement("!ex:B","!rdfs:subClassOf", "!ex:C");

        ts.addStatement("!ex:a","!rdf:type", "!ex:A");

        

        // Another query without reasoning using functor q 

        pquery = "(?x ?y) (q- ?x !rdf:type ?y)";

        AGUtils.doPrologQuery(ts, pquery);



        // Now demonstrate reasoning with functor q

        pquery = "(?x ?y) (q ?x !rdf:type ?y)";

        AGUtils.doPrologQuery(ts, pquery);

        

        // Close the triple store and disconnect from the server.

        ts.closeTripleStore();

        ags.disable();

    }

}
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