provider sample demonstrates the endpoints based on Provider API 
     
     * The service implementation class has two methods:
         * invoke() gets SOAPMessage payload as Source argument. Source is used
           to find the numbers and a new Source is created with the sum of those
           two numbers.
         * sendSource() is used to create the new Source with the sum.
     * etc - configuration files
         * AddNumbers.wsdl wsdl for this endpoint
         * custom-client.xml client customization file
         * custom-server.xml server customization file
         * build.properties, deploy-targets.xml ant script to deploy the endpoint
           war file
         * sun-jaxws.xml deployment descriptor for web container
     * src source files
         * client/AddNumbersClient.java - client application
         * server/AddNumberImpl.java - server implementation
     
     * To run
         * set JAXWS_HOME to the JAX-WS installation directory
         * ant clean server - compiles server classes does the deployment
         * ant clean client run - runs wsimport on the published wsdl by the deplyed
           endpoint, compiles the generated artifacts and the client application
           then executes it.
     
     * Prerequisite
     
     Refer to the Prerequisites defined in samples/docs/index.html.
     
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