docs: def add(self, parent, obj_type, **attributes):
          """ IXN API add command
  
          @param parent: object parent - object will be created under this parent.
          @param object_type: object type.
          @param attributes: additional attributes.
          @return: IXN object reference.
          """
          return self.ixnCommand('add', parent.obj_ref(), obj_type, get_args_pairs(attributes))