docs: public List<String> getResourceList() {
  
          if (m_resourceList == null) {
              // use lazy initializing
              if (getParamResourcelist() != null) {
                  // found the resourcelist parameter
                  m_resourceList = CmsStringUtil.splitAsList(getParamResourcelist(), DELIMITER_RESOURCES, true);
                  Collections.sort(m_resourceList);
              } else {
                  // this is a single resource operation, create list containing the resource name
                  m_resourceList = new ArrayList<String>(1);
                  m_resourceList.add(getParamResource());
              }
          }
          return m_resourceList;
      }