code: public void substituteLinkForRootPath(final String rootPath, final I_CmsSimpleCallback<String> callback) {
  
          CmsRpcAction<String> action = new CmsRpcAction<String>() {
  
              @Override
              public void execute() {
  
                  getVfsService().substituteLinkForRootPath(getSiteRoot(), rootPath, this);
              }
  
              @Override
              protected void onResponse(String result) {
  
                  callback.execute(result);
              }
          };
          action.execute();
      }
docs: Returns the absolute link to the given root path.<p>
  
  @param rootPath the root path
  @param callback the callback to execute