@utilities.arguments_not_none<EOL><INDENT>def order_proficiency_results(self, proficiency_search_order):<DEDENT>
raise errors.Unimplemented()<EOL>
Specify an ordering to the search results.

        arg:    proficiency_search_order
                (osid.learning.ProficiencySearchOrder): proficiency
                search order
        raise:  NullArgument - ``proficiency_search_order`` is ``null``
        raise:  Unsupported - ``proficiency_search_order`` is not of
                this service
        *compliance: mandatory -- This method must be implemented.*