@abc.abstractmethod<EOL><INDENT>def assign_asset_to_repository(self, asset_id, repository_id):<DEDENT>
pass<EOL>
Adds an existing ``Asset`` to a ``Repository``.

        :param asset_id: the ``Id`` of the ``Asset``
        :type asset_id: ``osid.id.Id``
        :param repository_id: the ``Id`` of the ``Repository``
        :type repository_id: ``osid.id.Id``
        :raise: ``AlreadyExists`` -- ``asset_id`` already assigned to ``repository_id``
        :raise: ``NotFound`` -- ``asset_id`` or ``repository_id`` not found
        :raise: ``NullArgument`` -- ``asset_id`` or ``repository_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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