code: def get_parent_ids(self):
          
          id_list = []
          from ..id.objects import IdList
          for parent_node in self._my_map['parentNodes']:
              id_list.append(str(parent_node.ident))
          return IdList(id_list)
docs: Gets the parents of this node.
  
          return: (osid.id.IdList) - the parents of this node
          *compliance: mandatory -- This method must be implemented.*