@abc.abstractmethod<EOL><INDENT>def get_qualifier_hierarchy_search_order(self):<DEDENT>
return<EOL>
Gets the search order interface for a qualifier hierarchy.

        :return: the hierarchy search order
        :rtype: ``osid.hierarchy.HierarchySearchOrder``
        :raise: ``Unimplemented`` -- ``supports_qualifier_hierarchy_search_order()`` is ``false``

        *compliance: optional -- This method must be implemented if
        ``supports_qualifier_hierarchy_search_order()`` is ``true``.*