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: STC object reference.
          """
  
          response = self.post(self.server_url + parent.ref + '/' + obj_type, attributes)
          return self._get_href(response.json())