code: public void clearHandlers() {
  
          for (Map<String, CmsAttributeHandler> handlers : m_handlers) {
              for (CmsAttributeHandler handler : handlers.values()) {
                  handler.clearHandlers();
              }
              handlers.clear();
          }
          m_handlers.clear();
          m_handlers.add(new HashMap<String, CmsAttributeHandler>());
          m_handlerById.clear();
      }
docs: Clears the handler hierarchy.