code: public I_CmsSitemapServiceAsync getService() {
  
          if (m_service == null) {
              m_service = GWT.create(I_CmsSitemapService.class);
              String serviceUrl = CmsCoreProvider.get().link("org.opencms.ade.sitemap.CmsVfsSitemapService.gwt");
              ((ServiceDefTarget)m_service).setServiceEntryPoint(serviceUrl);
          }
          return m_service;
      }
docs: Returns the sitemap service instance.<p>
  
  @return the sitemap service instance