docs: private String getCacheKeyForCurrentProject(String systemId) {
  
          // check the project
          boolean project = (m_cms != null) ? m_cms.getRequestContext().getCurrentProject().isOnlineProject() : false;
  
          // remove opencms:// prefix
          if (systemId.startsWith(OPENCMS_SCHEME)) {
              systemId = systemId.substring(OPENCMS_SCHEME.length() - 1);
          }
  
          return getCacheKey(systemId, project);
      }