def get_repository_form_for_update(self, repository_id=None):
<EOL>if not self._can('<STR_LIT>'):<EOL><INDENT>raise PermissionDenied()<EOL><DEDENT>else:<EOL><INDENT>return self._provider_session.get_repository_form_for_update(repository_id)<EOL><DEDENT>
Gets the repository form for updating an existing repository.

        A new repository form should be requested for each update
        transaction.

        arg:    repository_id (osid.id.Id): the ``Id`` of the
                ``Repository``
        return: (osid.repository.RepositoryForm) - the repository form
        raise:  NotFound - ``repository_id`` is not found
        raise:  NullArgument - ``repository_id`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*