@abc.abstractmethod<EOL><INDENT>def search_among_vaults(self, vault_ids):<DEDENT>
pass<EOL>
Execute this search among the given list of vaults.

        :param vault_ids: list of vaults
        :type vault_ids: ``osid.id.IdList``
        :raise: ``NullArgument`` -- ``vault_ids`` is ``null``

        *compliance: mandatory -- This method must be implemented.*