def get_asset_temporal_session_for_repository(self, repository_id=None, proxy=None):
if repository_id is None or proxy is None:<EOL><INDENT>raise NullArgument<EOL><DEDENT>raise Unimplemented()<EOL>
Gets the session for retrieving temporal coverage of an asset for the given repository.

        arg:    repository_id (osid.id.Id): the ``Id`` of the repository
        arg:    proxy (osid.proxy.Proxy): a proxy
        return: (osid.repository.AssetTemporalSession) - an
                ``AssetTemporalSession``
        raise:  NotFound - ``repository_id`` not found
        raise:  NullArgument - ``repository_id`` or ``proxy`` is
                ``null``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_asset_temporal()`` or
                ``supports_visible_federation()`` is ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_asset_temporal()`` and
        ``supports_visible_federation()`` are ``true``.*