@utilities.arguments_not_none<EOL><INDENT>def get_asset_ids_by_repositories(self, repository_ids):<DEDENT>
<EOL>id_list = []<EOL>for asset in self.get_assets_by_repositories(repository_ids):<EOL><INDENT>id_list.append(asset.get_id())<EOL><DEDENT>return IdList(id_list)<EOL>
Gets the list of ``Asset Ids`` corresponding to a list of ``Repository`` objects.

        arg:    repository_ids (osid.id.IdList): list of repository
                ``Ids``
        return: (osid.id.IdList) - list of asset ``Ids``
        raise:  NullArgument - ``repository_ids`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*