ModelBuildingEventCatapult BUILD_EXTENSIONS_ASSEMBLED = new ModelBuildingEventCatapult() {
        @Override
        public void fire(ModelBuildingListener listener, ModelBuildingEvent event) {
            listener.buildExtensionsAssembled(event);
        }
    };

    /**
     * Notifies the listener that the model has been constructed to the extent where build extensions can be processed.
     *
     * @param event The details about the event.
     */
    void buildExtensionsAssembled(ModelBuildingEvent event);