docs: public void cacheContentDefinition(String systemId, CmsXmlContentDefinition contentDefinition) {
  
          String cacheKey = getCacheKeyForCurrentProject(systemId);
          m_cacheContentDefinitions.put(cacheKey, contentDefinition);
          if (LOG.isDebugEnabled()) {
              LOG.debug(Messages.get().getBundle().key(Messages.LOG_ERR_CACHED_SYSTEM_ID_1, cacheKey));
          }
      }