code: @Override
      public boolean clearRegistry() throws SalException {
          boolean result = this.serviceManager.clearServices();
          // Only try if we could delete the services
          if (result)
              result = result & this.docManager.clearDocuments();
  
          // Only try if we could delete the services and the docs
          if (result)
              result = result & this.kbManager.clearKnowledgeBase();
  
          return result;
      }
docs: Clears the registry entirely: all documents and services are deleted
  This operation cannot be undone. Use with care.
  
  @return true if the registry was cleared.
  @throws SalException