code: def get_assignable_vault_ids(self, vault_id):
          
          # Implemented from template for
          # osid.resource.ResourceBinAssignmentSession.get_assignable_bin_ids
          # This will likely be overridden by an authorization adapter
          mgr = self._get_provider_manager('AUTHORIZATION', local=True)
          lookup_session = mgr.get_vault_lookup_session(proxy=self._proxy)
          vaults = lookup_session.get_vaults()
          id_list = []
          for vault in vaults:
              id_list.append(vault.get_id())
          return IdList(id_list)
docs: Gets a list of vault including and under the given vault node in which any authorization can be assigned.
  
          arg:    vault_id (osid.id.Id): the ``Id`` of the ``Vault``
          return: (osid.id.IdList) - list of assignable vault ``Ids``
          raise:  NullArgument - ``vault_id`` is ``null``
          raise:  OperationFailed - unable to complete request
          *compliance: mandatory -- This method must be implemented.*