@abc.abstractmethod<EOL><INDENT>def assign_package_to_depot(self, package_id, depot_id):<DEDENT>
pass<EOL>
Adds an existing ``Package`` to a ``Depot``.

        :param package_id: the ``Id`` of the ``Package``
        :type package_id: ``osid.id.Id``
        :param depot_id: the ``Id`` of the ``Depot``
        :type depot_id: ``osid.id.Id``
        :raise: ``AlreadyExists`` -- ``package_id`` is already assigned to ``depot_id``
        :raise: ``NotFound`` -- ``package_id`` or ``depot_id`` not found
        :raise: ``NullArgument`` -- ``package_id`` or ``depot_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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