@abc.abstractmethod<EOL><INDENT>def move_node_ahead(self, parent_id, reference_id, id_):<DEDENT>
pass<EOL>
Moves a node ahead of a refrence node under the given parent.

        :param parent_id: the ``Id`` of the parent node
        :type parent_id: ``osid.id.Id``
        :param reference_id: the ``Id`` of the node
        :type reference_id: ``osid.id.Id``
        :param id: the ``Id`` of the node to move ahead of ``reference_id``
        :type id: ``osid.id.Id``
        :raise: ``NotFound`` -- ``parent_id, reference_id,`` or ``id`` not found, or ``reference_id`` or ``id`` is not a child of ``parent_id``
        :raise: ``NullArgument`` -- ``parent_id, reference_id,`` or ``id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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